09.18: A wire has a conventional cb yzwmh)m u;,.nwd )p-v52bamurrent I directed to the right. At the instant shown in the figure, an electron has a velocity directed to the left. The magnetic force on the electron at thismvda,nb)-whzm);mb2 wu .py 5 instant is

  14.24: For the bar magnet shown in the figure, which c;h e6zwfpl :i;:7xy;zr h;z gchoice best describes the directiofz 6 x :cylzw:p;;rhig;zhe;7n of the magnetic field at the point P located directly above the center of the magnet?

  11.34: A wire lies in the plannuu d,;u mkq-)f my, gwdie)3-e of the page with conventional current I shown. At the instant shown, what is the direction of the magnetic force on the electron that is moving directly to the right toward the winud-3q; u u wmef)ig,-,)mkyd re?

  13.30: Electrons flow to the left in a wirert c/fja9j8n:x),u )jafjcdot5kf23 as shown. For the proton moving toward the top of the page at the instant shown, what is the direction of the magnetic force on the protond2cj r)aof9f3 )uj /t8j ak:fcj5,xtn?

  94.30: The conventional current I in a loij7qt7;v1 puo ,ck*qq ng straight wire flows in the upward direction as shown 1upoktq*7q7vji,c ;q in the figure. (Electron flow is downward.) 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 with constant speed enters a univ k 1v/6zmzpml)y0sn0form magnetic field whose direction is perpendicular to the particle’s veloy1 m/v0szn)0z p6 kmvlcity. The particle will:

  98.10: A charged particle with constant velocity enters a uniform magneti3 ,g9tqk cu(hvc field whose dig 9u(cqkv,h3trection is parallel to the particle’s velocity. The particle will

  03.34: A positively charged particl jwe.vh;i h*v)(m6 nwoe of mass M is 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 plane of the table. What is true about the magnitude of the electric force on the particlheh 6monjwv) v ;.i*w(e $F_E$ compared to the magneti force on the particle $F_B$?

  16.24: A proton moves with constant non-zero veloxdr 9y u70ga8pg0ycm *city in a region of space that x 07dga08r*y9cympu ghas a uniform magnetic field directed into the plane of the page. 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 nej7g*nk/bm7ii:fp4 sr y2 uk17vho1dq gligible weight is released from rest between the poles of a horseshoe magnet as shown. What would be the direction of the acceleration of the charge caused by the magn jgd:ov7k mqpi u/7sb7k*i 4h1f1yrn2etic field?

  10.26: An electron moving in the .qakos m5vw 0:plane of the page at an angle of 300 to the horizontal enters a region with a constant magnetic field directed horizontally in thew.s 5qa :k0ovm 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 on the electron?

  11.29: An electron moves with s4klj (i77 qg n3twb6qqpeed $1.00× 10^3\: m/s$ 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 charpe h5n-l r+vx7ge −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 amoup +lvxn 7reh-5nt of work done by the magnetic force on the electron in this time?

  97.28: An ion with charge k neq3 ufeqx).9zse ms 5163nrq, mass m, and speed v enters a magnetic field B and is deflected into a path with a radius of curvature R. If a second ion has speed 2v, while msxz.uqesm9 nr 3qe1fen35) 6k , q, and B are unchanged, what will be the radius of the second ion’s path?

  16.44: A proton moves in a circular orbit in a uniforqdt , u*x2ywn*m magnetic field B. A helium nucleus moves in a circular orbit in the same magnetic field. If each particle experiences the same magnitude magn*dyw 2,nxtq*uetic 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 perp6tzd6 rj5. k5wxsfj0-qbrl l5endicular to the same uniform magnetic field. The ions carry the same charge and have thefr6x.-05 sz krwd56 jb5tqjll same path radius in the magnetic field. Which of the following quantities must be the same for the two ions?

  02.15: A positively charged particle moves to the right. It enters a r;3w sppzq/i7oq 7pmq0egion of space in which there is an electric field directed up the plane of iqqms73w/zop;p7 qp 0 the paper (see figure). In which direction does a magnetic field have to point in this region so that the particle maintains a constant velocity?

  96.40: A proton of mass M and kinet*ef, + * orovfzc-akabir(80hic 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 . gsn-z p 9bdqmx2ob;z g66f5xelectrically charged beta particles is commonly determined bz9d2bgxo5b6f-qs xpg ;n.z 6my

  09.27: A proton moves straight up the plane of this page into a region that has 23oxpd.u/+a fvm5xy4jw6q ysa magnetic field directed to the right. If the parti4yu3jwy d qfsp/+vxom25x .6acle 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 in the plane of the page through two regionsgbbmmr+;5-t d9 fjyn2awpk 43 of space along the dotted-line trajectory shown in the figure. There is a uniform electric fi;3y-kt mdm nwgrbb5f ja29p+4eld 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 qr04qj koi6i1q)38xky+ if0oy)bvoh velocity through a region of space containi84k60b)yof)0 y iqij 1o+ vrkhqo q3xing 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 directly bqbi3 :9r;0jt(kf ie1j+oy ay tetween two long straight wires. The conventional current in each wire has the same magnitude, but the currents are in opposite directions as shown i ayb(itjo1f;:3 r0tiqk+9 yejn the figure. Ignoring gravity, which choice 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.