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习题练习：Physics Unit21: Electromagnetic Induction & Faraday's Law
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 作者: admin    总分: 142分  得分: _____________

答题人: 游客未登录  开始时间: 22年08月20日 21:29  切换到: 整卷模式

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1#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following are units of magnetic flux exc 5*sy agg 3:cr ui38moc9woaw9ept

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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Faraday's law of induction states tha2oo c3rqpe t.1t the $emf$ induced in a loop of wire is proportional to

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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the number of loops of wire in a coil produces3 e ns ,ygny3 9rxmf5nd:p0 ki))p5wls what kind of change on the inducn95n wr3s e),fg ln3d0 5p: xi)kpysmyed $emf$, assuming all other factors remain constant?

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4#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the strength of the magne19amd,fjq xp* w+rpn0tic field through a loop of wire produces whatpm pw0rnf +1j d9*qx,a kind of change on the induced $emf$, assuming all other factors remain constant?

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the diameter of a loop of wire produbm wdnzq)z2 72ces what kind of change on the induc nm2bw)2d z7qzed $emf$, assuming all other factors remain constant?

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6#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As a coil is removed from a magnetic field rztk(8 ff x;lojaun/o0a/7q 9 an $emf$ is induced in the coil causing a current to flow within the coil. This current interacts with the magnetic field producing a force which

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  According to Lenz's law, the direction of an induced c k3( y58i o bzr+(ltdkgud ;*zqdj91ozurrent in a conductor will be that which5 (*+3ijdqktdo1zd;o9lbryz(gu z 8k tends to produce which of the following effects?

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table.+:e 0yo0y vsd z,8vuvdqv52ce A bar magnet is held above its center with its north pole pointing down. The stationa ev 0,z5 80qed:y 2vco+svvydury magnet induces (when viewed from above)

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar mags5o) g27q /r;ktq nm;jpvec3*0 gh vbfnet is held above its center with its north po;e02s/vr 5v3gpkb7gq oc t jmn;h*)f qle pointing down, and released. As it approaches the coil, the falling magnet induces (when viewed from above)

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a table top in a region where the magnetic field vector poin an1m u+x3,mp0kb :bdxts nu+xk1 axmbp3d b0,m: straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced current in this coil as the field fades?

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a level table top0c+2ooeih3 tq /g+vvh in a region where the magnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction of the induced current in this coil as the/ c +to+0q vgeovih3h2 field increases?

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a horizontal table top in a region wher pmqj9a73; sqye the magnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, what is s7 p am;jyq39qthe direction of the induced current in this coil as the field disappears?

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A long straight wire lies on a horizont7x6r4l/jckffh 4k e 9sal table and carries an ever-increasing current northward. Two coils of wire lie flat on the table, one on either side of the wire. When vie/k7lsf649k4frcxh j ewed from above, the induced current circles

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A bar magnet falls through a loop of wire with t(s s3rlxo 1(09fvoq3eb; kvue+cdod*he north pole entering first. As the north pole enters the wire, the induced current will be (as viewed from o3+ 0oobeuslkdf * vs9d3(xqverc;1(above)

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constanq+ebnbvhiz8tbhm -gk:2 j+fi; .6l z9:oo ( gat angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of the loop's axis of rotgt-2 : foln+bjq8vkme+6a9;.bz:ihhg bio z (ation if the induced $emf$ is to be zero?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular speed l:yhb4 gd15/bc cjz5c5pwk s9 about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of the loop's axis of rotation if the15c bkph4w/5jb5 cl9gsz y:d c induced $emf$ is to be a maximum?

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17#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
State Faraday's law. eb bw:-)puf 9y;k/vrb
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18#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
State Lenz's law.
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19#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
List the three ways that an rs1 edk:u8pp:l ezuiy;iy 65 kr4)2 ho$emf$ can be induced in a loop of wire.
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20#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A wire moves across a magx ezz;p t2lk,5kc6l0gnetic field. The $emf$ produced in the wire depends on

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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal rod (orientedddp uo .1k6(f3q i(noj in the east-west direction) is moved northward at constant velocity through a magnetic field that points strapk .36 1ji(onqdf(du oight down. Make a statement concerning the potential induced across the rod.

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22#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar rotates at a constab; 0wbblg wb1,nt angular velocity $\omega$ about a vertical axis through one of its ends while in a constant magnetic field B that is directed down. The $emf$ induced between the two ends of the bar is

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23#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An electric generatory*, k7s+u,o2t dshrjn j35dqu transforms

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24#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator coil rotates through 60 revolutions each secb geapi; 98z+gppp k*2ond. The frequency of tig * +gbkp8pp29;zpa ehe $emf$ is

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25#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A transformer is a device used tosb +-/:4 vrcxxs )oevd

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26#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A transformer is a device tn,2ipm ,u/gvjhat

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27#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the secondary coil containsvcpkfw6r8-9,hp dr e+ more loops than the primary coil the frp p ,9c-v8e+wdk6hrn it is a

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28#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if-1fcv7+ld: tmw b k l- w+4p4lnc6ohsthrt.r2 the primary coil contains more loops than the secondary coil then it is 4 4lhct lhrw.7tpr:-6 2 wmlcfd+t-vkb on+1sa

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29#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, the power inp25tmq; mmw q70ap9jtrut

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30#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a given LC resonaprz0br(at lk5 )sc3d 5qp .9qlnt circuit,

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31#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inducti23lf z/zij w+or are connected in series to an ideal battery of constant terminal vo i23l/zzwjf+i ltage. At the moment contact is made with the battery, the voltage across the resistor is

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to an ideal battery of cok+hr2m fpq;o- nstant terminal voltage. At the moment contact is made with the battery, the voltage acrosso2+hkq ;fmp- r the inductor is

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resistance R is n k5,k- 1pitheconnected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the inductance is 2L. When it is connected to the same $emf$, what will be the final value of the current?

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34#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resista gd (+ey67 nob7ruf1c 0tlqki:nce R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the resistance is 2R. When it is connected to the same $emf$, what will be the final value of the current?

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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to a battery. The time conjy;7os5k t q8xstant for the circu7qko t8 ;j5yxsit represents the time required for the current to reach

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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductoj4 0rw+ihu nv9r are connected in series to a battery. The battery is suddenly removed from the circuit. The time constant for ovnru 4 hj+iw09f the circuit represents the time required for the current to decrease to

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37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following have the sagp4n,g. j og/7be,1(ycoaz efme units except:

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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor is connected totk8j :w(w ou mb zq(hp r7r-rluztwt0*45p9,o an AC power supply. On this circuit, the current

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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure inductor is connected to an AC power supply. In this circuit, the cu )kenoo n:ig+:rren n+gi k::ne)oot

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The inductive reactance in an ac circuit change5( ,.luhf; t0gukksz cs by what factor when the frequency istg ; us 5ch.uz,(k0kfl tripled?

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41#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the frequency of the ACsyd;bf nz/- z)8mkh;u voltage across an inductor is doubled, the inductive reactanc;mh/;y su z zn8)-fdbke of that inductor

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42#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across an inductor approache c)esskr6ms)5( w dnh* ;o1xfqs zero, the inductive reactance of thd wf1xqc hnm 6kr) so5()es*s;at coil

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure capacitor is connected to an AC power supply. z2eq;(+ghmkp yx;9ax In this circuit, the curre;9xxq gy2;ahk+pe zm(nt

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The capacitive reactance in an ac circuit changestw6l (t:b qe7x;*4vng-vwuef h lt; 8y by what factor when the frequew; q- fv; v74wl8*: htlxnuy6egtebt( ncy is tripled?

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45#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of t scqplba (q6s5n,. 1g3mhl b+mhe AC voltage across a capacitor approaches zero, the capacitive react6.b 3,mhcbslm ngpq5+ a(s 1lqance of that capacitor

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle 7lfucui4-b6pn; ( kqvbetween the voltages of the inductor and capacitor in a RLC serkcvqub 7ulpn(;-64 ifies circuit?

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47#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The power factor of an RLC circuit is defigo6 l ok rw419s5enhqq45xl e0ned as $\cos M = R/Z$, but the phase angle can also be calculated from .

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of the circuit increases if R inx)r+ d at4hk*fcreases. When is this s+x kd4hft)*r atatement true?

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of m a.; x6ww(mkzmz,t.5g:vwr sqr;nx 5the circuit increases if $X_L$ increases. When is this statement true?

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50#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC series circuit. The impedance of ta (wzyiqbx)ie1;(hgj w +u fe;9/4nsohe circuit increases if $X_C$ increases. When is this statement true?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the inductance and the capacitanca+ hr ,okhyg*3e both double in an LRC series circuit, the resonant freque,r gaoh3ky*+h ncy of that circuit will

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52#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit that is ou9c.8 xsat a)zdk. p+driven by an AC applied voltage. At resonance,

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53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Resonance in a series RLC circuit occursz8 yr, oovsd)4 when

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54#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A flux of $4.0 \times 10^{-5} \; Wb$ is maintained through a coil for 0.50 s. What $emf$ is induced in this coil by this flux?

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55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m rklk/j ,/ched,2pt; - +.eiuafcop -o is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and ,-e/2uo.+of dphck/;-tr pcak je il,the magnetic field vector are parallel.

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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating ijpsmia : n 10bh.e,y:yn a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and thaj1p.bsyih :n:ey,0 m e magnetic field vector are perpendicular.

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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is k, b 5qwt2h1hgrotating in a uniform magnetic field of 0.20 T. Find the magnetqb hkt1 gwh5,2ic flux through the loop when the plane of the loop and the magnetic field vector are at an angle of $30^{\circ}$.

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The cross-sectional area of an adjustablhhe r, e8dkw-.e single loop is reduced from $1.0 \; m^{2}$ to $0.50 \; m^{2}$ in 0.10
s. What is the average $emf$ that is induced in this coil if it is in a region where B = 2.0 T upward, and the coil's plane is perpendicular to B?

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59#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The flux through a coil changes (t ep9d v3+(ia3qd pio6hu2qn from $4.0 \times 10^{-5} \; Wb$ to $5.0 \times 10^{-5} \; Wb$ in 0.10 s. What $emf$ is induced in this coil?

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60#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil is wrapped with 200 turns of wire on a square fra,bu* vlxu l,xow3x-f4 me with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the field changes l *wu xfx-vx3,u,4 lbouniformly from 0.50 T to 0 in 8.0 s, find the average value of the induced $emf$.

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61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A square coil of wire with 15 tuu.2shlbr f1 xf m-5s8yqfe0e0 rns and an area of $0.40 \; m^{2}$ is placed parallel to a magnetic field of 0.75 T. The coil is flipped so its plane is perpendicular to the magnetic field in 0.050 s. What is the magnitude of the average induced $emf$?

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62#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil of 160 turns anf91u+sx hitk-)ke(h5at re dsk . +a8kd area $0.20 \; m^{2}$ is placed with its axis parallel to a magnetic field of 0.40 T. The magnetic field changes from 0.40 T in the x-direction to 0.40 T in the negative x-direction in 2.0 s. If the resistance of the coil is 16 W, at what rate is power generated in the coil?

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63#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An airplane with a wil la65s 7axfw4/ 3 mg*spewl)eng span of 60 m flies horizontally at a location where the downward component of the Eartwp67gm el/ls e )l*5faa4sx3 wh's magnetic field is $6.0 \times 10^{-5} \; T$. Find the magnitude of the induced $emf$ between the tips of the wings when the speed of the plane is 225 m/s.

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64#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar that is 2.0 m long rotates at a constant angular velocityg;gps 0+kxu: l of 2.0 rad/s about a vertical axis through one of its ends while in a constant magnetic fx;g+0lspgu: k ield of $5.0 \times 10^{-5} \; T$. If the magnetic field vector points straight down, what $emf$ is induced between the two ends of the bar?

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The coil of a generator has 50 lo 6wg-1z,ql/h d bk,i,.tw xmziops and a cross-sectional area of $0.25 \; m^{2}$. What is the maximum $emf$ generated by this generator if it is spinning with an angular velocity of 4.0 rad/s in a 2.0 T magnetic field?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns of wve4)-kl;vzg7t0t u 25xc -gpf0vvlwyire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced $emf$.

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67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator has 80 rectangular loop ,t v5pmaawc208v oc.xs on its armature. Each loop is 12 cm long and 8 cm wide. The armature rotates at 1200 rpm about an axis parallel to tv8c.a20 mx cpto ,avw5he long side. If the loop rotates in a uniform magnetic field of 0.30 T, which is perpendicular to the axis of rotation, what will be the maximum output voltage of this generator?

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68#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns ofb n/7h39r zzpau) kfy+ wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced current.

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69#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose that you wish to construct a simple AC generator with an outputq 3q- tvpt+wec q dz y)x2/5kric;6+yt of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is available. If the area of the rotating coil is v)xzq/2 e63 ;cwtqyd+5+cqkt- rt yip $100 \; cm^{2}$, how many turns are needed?

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70#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You are designing a generator wi5iqp2y a*n8t vth a maximum $emf$ of 8.0 V. If the generator coil has 200 turns and a cross-sectional area of $0.030 \; m^{2}$, what would be the frequency of the generator in a magnetic field of 0.030 T?

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71#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.00 W.:p : kr7o 0.kcbbvad yyrme624 The motor operates on $120 \; V$ AC, and when running at full speed it generates a back $emf$ of 105 V. What is the starting current of the motor?

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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.00 W. The motor ope sym9n9e00q wjrates on 120 V AC, and when running at full sp 09ym0qjsnw9 eeed it generates a back $emf$ of 105 V. What current does the motor draw when operating at full speed?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V power supply.u u:nxy0 i3m9f The operating current is 1.0 A. What is the start-up curfy0 x:3n uu9imrent?

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V power su 7wc q3qf2bj(7hkh8ezpply. The operating curren f2wkhe qh8q3c7zb7j( t is 1.0 A at full speed. What is the back $emf$ when the motor is running at full speed?

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0vbpijcju0n3q 4x s+( - W is connected to a 24-V power supply. The operating current is 1.0 A at full spepx04 -qnbs ijuj 3+(vced. What is the back $emf$ when the motor is running at half speed?

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76#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A step-down transformer is nee,od *;zv:yqh3 st/wgc /;3pv(y cghjjded to reduce a primary voltage of $120 \; V$ AC to $6.0 \; V$ AC. What turns ratio is required?

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77#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  2.0 A in the 100-turn primary of a transformer causes 14k+ep5jdzetj. 6w( dn 2 A to flow in the secondary. H2zj +5 6p(eew.jtn kddow many turns are in the secondary?

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, how many turns are necessary in a 110-V primary ifjr9,6i bo f4( v cjsaynw9:i+f the 24-V secondarrb4 9, fnwaj:i 6oyf(cjs+ iv9y has 100 turns?

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An transformer consists of a 500-turn prl uyqo75 ohz2 qr91-(8 mcq;b.qvjzj aimary coil and a 2000-turn secondary coil. 7 q8v -u2hl jqzj9;b 5moy(oq1cazq.r If the current in the secondary is 3.0 A, what is the current in the primary?

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80#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  5.0 A at 110 V flows in the primary of a tq* g;s) q:emcux-ebh0ransformer. Assuming 100% efficiency, how many ampse*suq-;:) bhxg qce0 m at 24 V can flow in the secondary?

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The secondary coil of a neon sign transformer provides xm1hl ((.7l 15vnmaf*pfomir7500 V at 10.0 mA. The primary coil operates on 120 V. Whatf mm *17 . xmo5nrla1lh(vpfi( does the primary draw?

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82#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns s7) (r ir2tsobfwh8+n on its primary coil and 300 turns on its secondas2 nh(7)o8wbri rstf +ry coil. If 120 V at 2.0 A is applied to the primary, what voltage is present in the secondary?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil and 300m0z ) oa4fe/mukli;ejye*x5 , turns on its secondary coil. If 120 V at 2.0 A is applied tj )xi y5 e;am4 0feo,/zmk*lueo the primary, what current is present in the secondary?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 10 ,h) atitc/os+31e m5egdvnynrj )(h .0 turns and its secondary has 200 turns. If the input current at the no5(rhaet/emdh+3g)n ,1csji.t y )vprimary is 100 A, we can expect the output current at the secondary to be

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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 200 turns. we(9bknq+;uru3r -fcr y ar;7If the input voltage to the primary is 100 V, we can expect the output voltage of the seconder(f;wr n;urq bu3- rc+97kayary to be

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 wni+t :vnjv;: turns and its secondary has 200 turns. If the power input to the primary is 100:inntv;wj :+v W, we can expect the power output of the secondary to be (neglecting frictional losses)

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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is usupks 6r;:ukgnz1k-l xdwl85m 0 ally stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the number of turns i:1nz r klg;8 ms5w- dkukl0x6pn the secondary if the primary has 200 turns.

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88#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is usualla13ovt6 t1ft 1 5yvdbjy stepped up to 4500 V by a t t1ftavt 3v1oy6 5d1jbransformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the transmission line.

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89#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 f q9( 9z:nb) ;fuvxmhxV. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of tx( nvqx mhu9bz:f f;)9otal resistance 1.0 W. Find the percentage power lost in the transmission line if the voltage is not stepped up.

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90#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km lono-iaqx1-; hc wg has a total resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy would be lost iiw-qx-1; ch oaf the transformer were not used?

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91#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50x80 0qrm7h,omxj(j e-azi xn5 km long has a total resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a tr5 j(0q-ej8ma0xoix7mz rx ,nh ansformer with a turns ratio of 100:1. What percentage of the original energy is lost when the transformer is used?

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92#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  100 kW is transmitted down a 6-W line at 1000 V. How much less power 7us, xeg5f 6vcwould be lost if the power were transmiue g5v 6c7x,fstted at 3000 V instead of at 1000 V?

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93#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The output of a generator is 440 V at 20 A. It is to be transm+*eyc kspx:tt9vl h+9itted on a line with resistance of 0.60 W. To what voltage must the generator output be stepped up with a transformer if the power loss in transmi 9etyxv+ +h*9ltpks:cssion is not to exceed 0.010% of the original power?

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94#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 4.0-mH coil carries a current of 5.0 A. How much energy is stored in theokdf j+e 0m6c3 coil's majc ko f6e+30dmgnetic field?

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95#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A simple RL circuit contains a 6.0-W resistor and an 18-H inductor. What9xlwktdp8f 1 0kd,c5 t is this circuit's time constant?dx9ck, 018fd5lkttp w

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96#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the peak voltage in an AC circuit where thwi; h- n/*tzl8gf+ urye rms voltage is 120 V?

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97#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What is the ttvb.j l2/h+e6.yd+;obbokj;j6hv l peak current?

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98#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What is the resistance of the qhjy49sz, ey/lamy9 zshj,ey q/4p?

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99#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac power supply. What is the peaklnl0swbvnl k,b,7*v+ m)e;r k current through the ren vv *l,esml7nrk + ;lwb,bk)0sistor?

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100#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac power supply. W45 a2,xguy v/wdik hr7s.uu.ahat is the power dissipate i7u4r,..a /vyduhu 2kgwasx5d in the resistor?

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101#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resist/ f2k-sdn umta d8w)x1or is $I = 0.80 \sin (240 t)$. What is the rms current?

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102#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resistor g; qwfdk4t;gnk t (s8+is $I = 0.80 \sin (240 t)$. At what frequency does the current vary?

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103#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W rj ( o0+ekpsqoh/x6gwe0k vhp6se/,7c esistor is $I = 0.80 \sin (240 t)$. How much power on average is dissipated in the resistor?

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104#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the reactance of a 1.0-mH inducto, 6q9oc91h o9 b-cygkorjbe b+r at 60 Hz?

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105#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the inductive reactance of a b k6 ,rxf7r5j-mrid:m2.50-mH coil at 1000 Hz?

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106#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will a 14.e; r+p (z 72sp).mebgsp.udra0-mH coil have 14.0 W of inductive reactance?

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107#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary for 157 W of inductive reacq8j9p /79y;y j *gduk wbkyqy0tance at 1000 Hz?

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108#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows in a 60-me7mpmu t u bi,l2*,(dtH inductor when 120 V AC at a frequency of 20 kHz is applied to ime2*i( l7 pdm,ub,tutt?

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109#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current throug2hg l gk.*7r 7,f()g kpkehteth a 2.50-mH coil due to a 110-V, 60.0 Hz source?

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110#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the capacitive reactance of a 4.7-mF capacitor at 10 kHf3y zhy wfnj - :rji4-8;bnd(rz?

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111#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor is needed to have 50 W of capacitive reactance at 10 s/3 olw paxs v*d4j ws93*h8xhkHz?

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112#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency does a 10-mF capacitor have a reactance of 1lo- ,b v8)4vbtxw3 kcv(ii fk-200 W?

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113#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will the capac l5:d sbo7gw 2eip6rt3 ;lpdf.itive reactance of a 0.010-mF capacitor be 100 W wlp;t7r5e. dlp o6g: ds3if2b?

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114#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 0.0010-mF ty0* ,grrf*ox capacitor at 1000 Hz and 5.0 V?

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115#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the impedance of an ac series circuit wft8ix gbnt( 82ith 12.0 W resistance, 15.0 W inductive rb8(8g2nt tfix eactance, and 10.0 W capacitive reactance?

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116#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the total impedance at 1500 Hz if a 1 v;0h9/bnwon 1)i d0vllz0u iv00-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in series9 lhi/)0u zlvw0o; nvvi1n d0b?

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117#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle at 1500 Hz if a o )2 pdtc 2+j./g+8epjmfwthg100-W resistor, 20-mH coil, and 1.0-mF capacitor are cojh.pfm+tw/ ecd82 jg)g+2 pot nnected in series?

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118#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20 q6ly0mq) hp1o-mH inductor, what is the impedmh0qyo)1p ql6ance at 1000 Hz?

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119#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-isewpd//ll7; mH inductor, what is the phase angle at 1000lil /s;d/w 7pe Hz?

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120#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in a series circuit with a 20-mH coil and 1.0-b c i80hv2ony(yb ( 7;-ntdypr;mkq. i 3kc9lnmF capacitor for a total impedance of 100 W at 1500 Hztky 2ccn bmn7;dk. ;0l y9 (8qhbn(iv-3ypo ri?

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121#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the following capacitances is needed in series .* rem t,h)8r:iirtbgwith a 100-W resistor and 15-mH coil to get a total . rt8,hbt*r) mi :geirimpedance of 110 W at 2000 Hz?

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122#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance must be put in series with a 8zzp thh (kj7,450-mH inductor at 5000 Hz for a total impedance 8zz,jh7ktp(h of 40000 W?

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123#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance must be put in series with a 100-kW resivy,a59+ 3 xmn:/ g5sppx zxgwhsh(4frstor at 1.0-MHz for a total impedance ox ah9p(p /+x,hz:mvws5 4rx5 yngsf3gf 150 kW?

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124#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected in series umzmxj o/zu g1) breiyi(;,a0y;*3 ghwith a 20-mF capacitor. What is the impedance at 1003*yz )/1yx m; zm0 aruji;,iuoeg(g bh0 Hz?

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125#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF ci0gi qi1e yg lxed; 496e4/bjdapacitor at 1.0 kHz for a total/g;gd064 ye exi9ljed iqi14b impedance of 45 W?

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126#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in smll1)b*1zyue-zf 2kveries with a 10-mF capacitor at 1.0 kHz for a phase an2z yz-m* kvfle1 bu)1lgle of $40^{\circ}$?

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127#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series ch8g.lq 9c6ley7xjt,r1hz 0j with a 30-W resistor at 1.0 kHz for a total imjcr98 ,.hlx17clzy 0et6jqh gpedance of 45 W?

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128#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is in series with a 100-mF capacitor at 120 Hz. What is then8 v6qg( htii5 phase hiqt5 n8g6 iv(angle?

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129#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows at 5.0 V and 1500 Hz if a 100-W resistor, 20-mH coil, and m**6dn0zlfd w 1.0-mF capacitor are connecte* nwdfm*zdl6 0d in series?

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130#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit consists of a 100-W resistor, a 10.00sghbbd5l e5 3-mF capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz powehsl3e 5dbb 5g0r supply. What is the rms current in the circuit?

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131#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistance of 55 W, a capacitor of22wjr,wozj(j(e:j st capacitive reactance 30 W, and an inductor of inductive reactance 30 W are connected in serie:ojztrs(jwje2,2 (jw s to a 110-V, 60-Hz power source. What current flows in this circuit?

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132#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle m4rdbq0n0) c h fce1eoz8u-x7zwj2g(for a series RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when conne7 q0ec)0 j24z n (e-xb dg8w1fuohrzcmcted to a 60-Hz power supply?

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133#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary in series with a 500-W resistor for a phase anglsxn*9t ; p4ssse of t4 s9p n;xs*ss$40^{\circ}$ at 10 kHz?

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134#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit has R = 20.0 W, L = 200-mH0no2 qi9z(twv , C = 10.0 mF. At what frequency should the circuit be driven in order to ha0o2i wv( qn9ztve maximum power transferred from the driving source?

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135#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power output in an ac series circuit with 12.0 W resistance,a)5vkbr *xn.is. gcjy; 5n )px 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit is connected to a 120-V powegx.jnp ) ;5xan. )y5kicsvrb*r supply?

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136#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The phase angle of an AC circuit is - 5:ehemy58zc5 eq) whmxr+pmh2tw:f$63^{\circ}$. What is the power factor?

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137#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ac series circuit has an impedan.gm hwwo:; zor v5:g*oce of 60 W and a resistance of 30 W. What is the power factowr ;o.m vh ::zog5o*wgr?

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138#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power factor for a * y e-x4iy*w0: egcvhtseries RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 6 g*vyy4-xc0:i* ewht e0-Hz power supply?

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139#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the resonant frequency of a 1.0-mF capacitor and a 15-mH coil in series?9t4:j;u g*fi re 9qs if/)revsqt e:) ffsjv9rugii/*9;r4 se

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140#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is needed in series with a bpw vh75y; gvozs7y58 4.7-mF capacitor for a resonant frequency of5h7yw yosg pb;75 8vvz 10 kHz?

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141#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in 1myto,r ae4fh; +3 (9 ugk)aljtw0 qfmseries with a 3.7-mH inductor for a resonant frequency of 1000 4lmwqfghmef1yo j uat ka 9)r(;,03+tHz?

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142#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor must be placed in series with a 30-W resistor dsmxab4308s2z* (sgzx q.ftd and a 40-mH coil if the resonant frequency of t z82.b0ts4mxqassz *fgxd3 (d he circuit is to be 1000 Hz?

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