09.18: A wire has a conventional current I directed to the right. At the i tg3 )6ndkugzl;cidx39gus 9:nstant shown in the figure, an electron has a velocity di s :d klt)ug6cx;gd93ng 93izurected to the left. The magnetic force on the electron at this instant is

  14.24: For the bar magnet shown in the figure, wo 69dza mnsiljn-6 +j4hich choice best describes the direction of the magnetic field at the point P +inm asn 9-4dlojj66z located directly above the center of the magnet?

  11.34: A wire lies in the plane o s: *sx)s4wrrogrzm17uq(d-:oh k1d4pz /dne f the page with conventional current I shown. At the instant shown, what is the direction of the magnetic force on the electron that is mo 1dorz)1:hz4 nsxr-/ :s(regk p 7qd*s4 uwdmoving directly to the right toward the wire?

  13.30: Electrons flow:,dhjad mhjt+ q -2qf4 to the left in a wire as shown. For the proton moving toward the top of the page at the instant shown,jh hmjq2q d,df:t +4-a what is the direction of the magnetic force on the proton?

  94.30: The conventional current I in a long straight wire flows in theww o2+n5iqx y-nnbd +uz 7pdgm(.i:m7 upward direction as shownn-pw i7wq7 xuo nmdm:b+g.2 y5i(+dnz 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 vkvr* l 99omt5constant speed enters a uniform magnetic field whose direction is9k9*mr5vto lv perpendicular to the particle’s velocity. The particle will:

  98.10: A charged particle with constant vern6 d x:rxf5f/locity enters a uniform magnetic field whose direction is paraldnrx/r : 6ffx5lel to the particle’s velocity. The particle will

  03.34: A positively charged particle of mass M is ajq i* 2/zz8*cgwzsf9mt 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 planfc9z*m 8 ijg z*sw/z2qe 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 constantij-)t98 xmcu *ggmb8 d non-zero velocity in a region of space that has a uniform magnetic field directed into the plane of the page. The proton moves directl c)b j8um8xgd *ti9g-my 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 electr6czkg0j gst-ylc z be/20+f m0ic charge of negligible weight is released from rest between the poles of a horseshoe magnet as shown. What would be the direction of the acceleration g s/ + 60ykl 2z0ccf0tg-zmbjeof the charge caused by the magnetic field?

  10.26: An electron moving in the plane of the page at an angle of 300 toq1o-cg4 4qm5isqdj90 yn j6rc 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 the diiq4o1 -459rqmdncj s0 6jqgcy rection of the resulting magnetic force on the electron?

  11.29: An electron moves with speedjw6ohm;s f2ufz 117x a $1.00× 10^3\: m/s$ 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 a pl-,ljpr3s ds/2kjyb-k5 ,b obm ane perpendicular to a magnetic field of magnitude B. The electron follows a circular path of radius R. In a time b sr-/ 2b,, 5 lmydjb-pkkjs3ot, 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 r:h7h f s pclucna2z08bw71u.m, and speed v enters a magnetic field B and is deflected into a7swhl71rcabph. u:zu0f 2c8n 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 ion’s path?

  16.44: A proton moves in a circular orbit in a uniform magnetic fiel5:3csoj.ero4t 4 i:emd. 4zb9f xhea cd B. A helium nucleus moves in a circular orbit in the same magnetic field. If each particle e4ci9bt .hd e5.zs:4 jae ef:orcomx34xperiences 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 perpenoyx l 66m82fsc)lq(f odicular to the same uniform magnetic field. The ions carry the same charge and have the same path radius in the magnetic field. Which of the following quaf66)ol(qms 2xo 8lc fyntities must be the same for the two ions?

  02.15: A positively charged particle moves to the right. It enters a rj )o.yvzka ) x v6/z+31tyabbregion 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 constant velocx6 .j1/ byaky )o)3btz +avvrzity?

  96.40: A proton of mass M and kine vt*rd,mqz3 x6 wqb6op6/bmdl. l/oy4 tic 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 chalw)bt ok2y n0m)v0i v :f45si5qlk,wzrged beta particles is commonly determined bi)y k0kv:mo5l,nt iq 40wbz2v ls)w f5y

  09.27: A proton moves straight up the plane of this page into a region that ha+ c;:+guoyb cos a magnetic field directed to the right. If the uy++; oc co:bgparticle 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 paffym,nu ;x2)07nhzv 9w c+ fisge 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 necessah,9nx0 fimvwf2y ) f;+sc 7unzry direction of the magnetic field in regions I and II?
Ignore gravitational forces.

  12.36: A positive charge moveslk5jupeo jf/84: a6k w with constant velocity through a region of space containio /aje:6 4kfj ukl5w8png 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 betwee/(kgv)x8pas9e :ij xtn 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 reflects the direction of the magnetic field and the direction of the electric field thx )pkgv/8i:(xt jase 9at exist at the location of the electron? Any electric field in the region originates from an unseen external source.