09.18: A wire has a conventional current I directed to the r 1dopuky q*8ecchcu-w*m9/j /ight. At the instant shown in the figure, an electron has a velocity directed to the left. The magnetic force on the electru chkjqwupd/*8 c y9*e/c-m1oon at this instant is

  14.24: For the bar magnet shown in the figure, which choice bestd .nf)lt,i aa. describes the di af)n,da. t.lirection of the magnetic field at the point P located directly above the center of the magnet?

  11.34: A wire lies in the plane of the page with conventional current I shown.lxjb79t gj6ay wm. x4eb6 v-*0k7y vyv At the instant shown, what is the direction of the magnetic force on the electron that is moving directly to the r0vx-6b e4j6gxw7 v7tvl .m* yyaybj k9ight toward the wire?

  13.30: Electrons flow to the left in a wire as shown. For the proton moving tj c y.*cf*nsfp5t(9eb oward the top of the page at the instant shown, what is the dir(pfecn btc5 y.jf*s9 *ection of the magnetic force on the proton?

  94.30: The conventional current I in a long straighth4ijhiol)j 3 upubu f/eq 4,:) wire flows in the upward direction as shown in the figure. (Electron flow is downwar4fuhuli h3, qbepj j/u )4):iod.) At the instant a proton of charge +e is a distance R from the wire and heading directly toward it, the force on the proton is:

  95.16: A charged particle witc) -mw6gq6 bish constant speed enters a uniform magnetic field whose direction is perpendicular to the particle’s velo qws6)b-ci6g mcity. The particle will:

  98.10: A charged particle with constant velocity enters a uniform magn2wqto/ hw sf+4)av0bjetic field whose directiotf)svbo/0awh 4+2 qjwn is parallel to the particle’s velocity. The particle will

  03.34: A positively charged particle of mass M is at rest on a table. A non- zoiimqk;v*oczv:hukx tssv- ne8/;+ x+44 9 ot ero electric fi+v+z9co 4i*nxvk;eso xt mth-s4;8 o: i /uvqkeld E is directed into the plane of the table. A non-zero magnetic field B is directed out of the plane of the table. What is true about the magnitude of the electric force on the particle $F_E$ compared to the magneti force on the particle $F_B$?

  16.24: A proton moves with constant non-zero velocity in a regionwcfrlh,akw 8e:7 hw:4 of space that has a uniform magnetic field directed into the plane of the page. kf:wrh7,w48ahcwe :l The proton moves directly up the plane of the page. What is the direction of the electric field in this region of space? Ignore gravity

  04.14: A positive electric charge of negligible weight is67seq/+ib6cst i2xv*hz -i i c released from rest between the poles of a horseshoe magnet as shown. What would be the direction of the acceleration tiizes67i x2 - qb+/cshc*v6 iof the charge caused by the magnetic field?

  10.26: An electron moving in the pl2*ga )yat4lrd )1tma lane of the page at an angle of 300 to the horizontal enters a region with a constant magnetic field directed horizontally in the plane of the page as shown. At the instant that the electron enters the magnetic field, which best describes) tlya1)*2at mgal 4dr the direction of the resulting magnetic force on the electron?

  11.29: An electron moves with 8gn 7ghz 1y,rdspeed $1.00× 10^3\: m/s$ as it enters a region of space that has only a uniform magnetic field. The electron is accelerated because of this field with a constant magnitude of $8.00× 10^5\: m/s^2$ for the entire time of $1.00× 10^{−3}s $ that it is in the field. With what speed would the electron exit the field? Ignore gravity.

  14.29 An electron with charykc:- if gf 48qat)sq9ge −e and mass m travels at a speed v in a plane perpendicular to a magnetic field of magnitude B. The electron follows a circular path of radius R. In a time t, the electron travels halfway around the circle. What is the amount of work done by the magnetic force on the electron in tyia9fqg stk c:4f-q )8his time?

  97.28: An ion with charge q, mass m, and speed v enters a magnetic fie-our-su* 5 nw;ayk c6xs:a2 p)uik;jjld B and is deflected into a path with a radius of curvature R. If a second ion has speed 2v, while m, q, and B are unchanged, what will be the radius of the second io5k*- syc :-;irak2joj;uu 6ps)aux nwn’s path?

  16.44: A proton moves in a cir8 wo.-- pklnjccular orbit in a uniform magnetic field B. A helium nucleus moves in a circular orbit in the same magnetic field. If each particle experiences the same magjplk8. -now- cnitude magnetic force during its motion, what is the ratio of the speed of the helium to the speed of the proton?

  10.43: Two ions travel p :e2a+y iwqfpyg dy-:1erpendicular to the same uniform magnetic field. The ions carry the same charge and have the same path radius in the mwgye:- :yqfy +pi2 1daagnetic field. Which of the following quantities must be the same for the two ions?

  02.15: A positively charged particle moves to the rig 7pg5z;zn.p5 -kwxs evht. It enters a region of space in which there is an electric field directed up the plane of the paper (see figure). In which direction does a magnetic field have to point in this region so thatk5x 7np g;-.zv5wp zse the particle maintains a constant velocity?

  96.40: A proton of massjeb mm dz -m7r4-o1jdygh,+v:yv v2 2o M and kinetic energy $E_k$ passes undeflected through a region with electric
and magnetic fields perpendicular to each other. The electric field has magnitude E. The magnitude
of the magnetic field B is:

  04.25: The speed of electrically charged beta particles is :rdzm)g*fpvy- wnv,*qi99 d qcommonly determined b:*gp)q zdiyv9vw- mrqd fn*, 9y

  09.27: A proton moves straight up the plane ofbc z-uq39)y kz this page into a region that has a magnetic field directed to the right. I)q3ybzc- zuk9f the particle is undeflected as it passes through this region, in what direction must there be a component of electric field? Ignore gravity.

  08.36: An electron moves lwi2f9:m tj1gzi14*dnwp xt* in the plane of the page through two regions of space along the dotted-line trajectory shown in the figure. There is a uniform electric field in Region I directed into the plane of the page (as shown). There is no electric field in Region II. What is a necesswt g19lzj wfix:t2*p4m 1 *ndiary direction of the magnetic field in regions I and II?
Ignore gravitational forces.

  12.36: A positive charge 7cq.- l4.giblac9g xws:rck 3moves with constant velocity through a region of space contl9 xk.g73gq.l 4cc: b-s riwacaining both an
electric field and a magnetic field. The electric field is directed out of the plane of the page.
Ignoring any gravitational field, which one of the following choices represents possible directions
of both the particle’s velocity and the total magnetic field in the region of space?

  15.29: An electron moves at constant non-zero velocity direzbrb*y gt z3gp95p; 5wctly between two long straight wires. The conventional current in each wire has the same magnitude, but the currents are in opposite directions as shown in the figure. Ignoring gravity, which choicbgw5*bztp5prz3y;9 ge best reflects the direction of the magnetic field and the direction of the electric field that exist at the location of the electron? Any electric field in the region originates from an unseen external source.