09.18: A wire has a conventional currenldd84p,ir z 2bt I directed to the right. At the instant shown in the figure, an electron has a velocity did4rdb i8l2,pz rected to the left. The magnetic force on the electron at this instant is

  14.24: For the bar magnet shown in the figure, which choice be81h ybn(qtzz e,8*vxdst describes the direction of the magnetic field at the point P located directly above the center of the vt x,1z*8b(dhzqne8 ymagnet?

  11.34: A wire lies in the plane of the page with conventional current I so ib,spq47kq 0hl,zf0 hown. At the instant shown, what is the dir,4hp,ki7slf z0qqob 0ection 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. For the proton movt/ vhr e.3mv(ring toward the top of the page at the instant shown, what is the direction of3vh/t r.m r(ev the magnetic force on the proton?

  94.30: The conventional current I in ax.kypdv /y,ha mk +q*+*8edfu long straight wire flows in the upward direction as shown in the figure. (Electron flow is downward.) At t8he vk /yxq+uk.da+ym,*p* fdhe 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 uniform magney3 kyh -b4;gg. lb7ssi14zvxktic field whose direction is perpendicular to 4 4k-31.7b lbsz gs vyhykgi;xthe particle’s velocity. The particle will:

  98.10: A charged particle with cr.y gl1 /ex8 09l6 l9xf7sjhlmse7 gcnonstant velocity enters a uniform magnetic field whose direction is p6h9mlgf /cxxrg8s7 le.l7 0sjly9n e1arallel to the particle’s velocity. The particle will

  03.34: A positively charged particostf)ohji /; ryt 7.b,cs) ;xmle 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 el)ry. j;so)th ftoi,mc/x ;7 sbectric force on the particle $F_E$ compared to the magneti force on the particle $F_B$?

  16.24: A proton moves with constan9pxv7;cvno 95ujlo p3t 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 plane of the page. What is the direction of the electr 3o5j7vp np9l9uoxv; cic field in this region of space? Ignore gravity

  04.14: A positive electri6h0- 74sk ec mqfutj1tc charge of negligible weight is released from rest between the poles of a horseshoe magnet as shown. What would be theqc6t1shu7mt 0je-k f 4 direction of the acceleration of the charge caused by the magnetic field?

  10.26: An electron moving in the plane of t 9kla/ck in2q5he 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 theknk92c/ ilqa 5 direction of the resulting magnetic force on the electron?

  11.29: An electron moves wi;wh+i6j h d -jwlf1:glo(p8vt th 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 spe )ddpiai 6:y+knxjv+4 ed 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 wora)i6d kv x+jny:ipd +4k 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 femo+4*pd b3uypm)vo kfn3x 0f/0 ;r tyield 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 unchanfp0;4 n upvtyod3 +*)omx 0b3rf/ek ymged, what will be the radius of the second ion’s path?

  16.44: A proton moves in a circular orbit in a g7bgs c2w9r)n: ax5bmuniform magnetic field B. A helium nucleus moves in 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 th5 nbgcwsb:9 arg2m)x7e helium to the speed of the proton?

  10.43: Two ions travel perpendicular to the same uniform magnetic fielg1d t7f9h ))hrbbjo; dd. The ions carry the same charge and have the same path radius in the magnetic field. Which of the following quanb;17hd9fothd)) jgr btities must be the same for the two ions?

  02.15: A positively charged particle moves to the right. It enters a regij 96mtgd;0mfry )xx3k on 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 that the particle maintains a constant3t6) ;r mm0dkjyxf9 xg velocity?

  96.40: A proton of mass M andqy1z ka)eb 68u 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 commonly determx.8n: kt*zt1u6cwg d0if2mf iined bguf:i 1kt2 zt8.0xwm6c*ni dfy

  09.27: A proton moves straa:fe;kxaahdhur0/; oe0 das 7yq:k ;ajo6 5 5eight up the plane of this page into a region that has a magnetic field directed to the right. If the particle is undeflected as it passes through this region, in what direction must the ;urh5 :dadqko0 :6e7ehakaae f;oy;a / xj0s5re be a component of electric field? Ignore gravity.

  08.36: An electron moves in the plane of the r6ow+6 a/ tv-fub:zbff9e9qb page through two regions of space along the dv9rff 6z w/6fa qb:9+tb-obue otted-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 necessary direction of the magnetic field in regions I and II?
Ignore gravitational forces.

  12.36: A positive charge moves with consaj8: e,o x8vbh /hkoofrk */f.tant velocity through a region of space containing both an o o/ej ,:8fkorfbh/ xa8.h*v k
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 between two loh/ 8vnq 5+3kdw ks*ma0jatjn6ng 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 benm*hdk+/ qk 3a68 jn0s5vtwja st 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.