09.18: A wire has a conventional current I directe )wdwl ,n.pd6p w2d52fbq t8ytd to the right. At the instant shown in the figure, an electron has a velocity directed to the left. The m 6pd 2b5y8plwnwt .2w,qddt )fagnetic force on the electron at this instant is

  14.24: For the bar magnet shown in the figure, which choice best descrlj2fd ) +9 )zyb/l8.sorbc tmwibes the direction of the magnetic field at )fob 8bz.lm2rwj9dytl+c/ s ) the point P located directly above the center of the magnet?

  11.34: A wire lies in the plane of the page with l8s g ubemq7f h;7(ox:conventional current I shown. At the instant shown, what is the directx m(8 ;q7lfob 7gush:eion of the magnetic force on the electron that is moving directly to the right toward the wire?

  13.30: Electrons flow to the left in a wire as shown. /humr)whsn; 2/5bd zqFor the proton moving toward the top of the page at the )2br/zdh m5nhw q/;usinstant shown, what is the direction of the magnetic force on the proton?

  94.30: The conventional current I g /0c-zzg1jxrp9v *pnin a long straight wire flows in the upward direction as shown in the figure. (Electron flow is downward.) At the instant a proton of charge +e is a distance R frozgzxgv /c*0r np-j p91m the wire and heading directly toward it, the force on the proton is:

  95.16: A charged particle with constand;,j ,sa 9w:ay/dfqsj ws7k3it speed enters a uniform magnetic field whose direction is pe 7d,;3sfaqk/as wiw:ysjj, 9drpendicular to the particle’s velocity. The particle will:

  98.10: A charged particle with constant velocity 1ijs i4iwgcrn+ nie 5lp9a90t1 60edq enters a uniform magnetic field whose direction is parallel to the particle’s velocity. The p4 ntwicenl r0i09dj+ ei 1gsq5pai6 91article will

  03.34: A positively charged particle of mass M i0qzhw 3abpi c-q,1v5w3bd)c js at rest on a table. A non- zero electric field E is directed into the plane of the table. A non-zero magnetic field B is directed out of the q q -3wzdv bh,5bp13wj)ca i0cplane 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 5soa)py+j a0iwith constant non-zero velocity in a region of space that has a uniform magnetic field directed into the plane of the page. The proton moves directly up the plan sa )5o0pja+yie of the page. What is the direction of the electric field in this region of space? Ignore gravity

  04.14: A positive electaxbi0g ,4ppz7ric charge of negligible weight is released from rest between the poles of a horsesho7p a zg0x4p,bie magnet as shown. What would be the direction of the acceleration of the charge caused by the magnetic field?

  10.26: An electron moving in the plane of the page at an angle of 300 to the qg5s7*x /tdom 7sxcwtghthjn4a, y ga9; ,7a,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 the direction of the resulting magnetic force ogn7/ q w s x9,aa;t*dc5tyxhga 47,t mg,johs7n the electron?

  11.29: An electron moves with .zdd0el bmd/u,d7rn*speed $1.00× 10^3\: m/s$ 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 charge −e and mass m travels at a speed v in t+9 c.h0r*tecksycu a+qf-q1: j9 le-mal 1kf a plane perpendicular to a magnetic field of magnitude B. The electron follows a circular path of radi+t 9u1y-f afcae0s*ktcc-1 mleh r:9q+j.lqkus 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 this time?

  97.28: An ion with charge q, mass m, and speed v enters a magnetic field B and iesgy- tnw* 5jc:l( o2ps deflected into a path we:*y (ntl2cp-josw5gith 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 ion’s path?

  16.44: A proton moves in a omfyk9b5 1:jkb.m,p xcircular orbit in a uniform magnetic field B. A helium nucleus moves p.b fk1y:,xb mm5 9kjoin a circular orbit in the same magnetic field. If each particle experiences the same magnitude 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 perpendicular to the same uniform magnerh;;i;waxs 0ljnkr sp;5w7 o-tic field. The ions carry the same charge and have the same path radius in the magnetic field. s-i hro0x ; nlr;wa;wk;75pjs Which of the following quantities must be the same for the two ions?

  02.15: A positively charged particle moves to the r 9iu1)na05lr sok2z lci;jmi0ight. 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 hav;1i) jm0acrl5uis kloin90z 2 e to point in this region so that the particle maintains a constant velocity?

  96.40: A proton of mass M and kinetici p-4. jfc ak;k9us7 5vee4 t2h lsv2gkmtm:e, 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 ch9 h.e cg;pmuowu9o5f dlcnq9 h7r27* varged beta particles is commonly determined byg7 nh.c97u v92q 5dec u r*hom;lof9wp

  09.27: A proton moves straight up the plane of this page into a refej n*keim3kd-990 oo4eb4cktagj+ 8gion that has a magnetic field directed to the right. If the particle is undeflected as it passes through this region, in whetiedn+k9 o8k4a f jc9ojmeb*40k g3-at direction must there be a component of electric field? Ignore gravity.

  08.36: An electron movlgi iplpat/5mog0*)u5g/ 5mfes in the plane of the page through two regions of space along the dotted-line trajectory gp/i5u0l5tigflg a5 /po *m)mshown 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 necessary direction of the magnetic field in regions I and II?
Ignore gravitational forces.

  12.36: A positive charge moves with constant veloci helha9dl*3z 9ty through a region of space containing boa ll9*3d ze9hhth 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 velocit fgzcj1u;qf e10nh7 .0e g3y3 p2zzxriud4 h9my directly 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 choice best reflectz3p x guyc f;h 0d7jzig29un.qf1e13zhe 4 r0ms 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.