09.18: A wire has a conventional current I directed to the right.i fdta .r9.mv9 At the instant shown in the figure, an electron has a velocity directed to the left. The rmt9ida 9f. .vmagnetic force on the electron at this instant is

  14.24: For the bar magnet shown in the figure, which choice best describes the ;gagja(k3 4 t*n xjh0pdirection of the ma;3p txj*g(j n 0aa4kghgnetic field at the point P located directly above the center of the magnet?

  11.34: A wire lies in the plane of th glx3)e b-:yj(taweu6e page with conventional current I shown. At the instant shown, what is the direction of the magnetic force on the electron that is moving dija 3 ewu6(by-)tge :xlrectly to the right toward the wire?

  13.30: Electrons flow to the left in a wire as shown. For the proton moving towa 8gkv*y+lv66wu-jy s(5jag5tvtmx 9t rd the ym5-l*t6jy v+v 9j8k ta(sgxt6v u5wgtop of the page at the instant shown, what is the direction of the magnetic force on the proton?

  94.30: The conventional current I in a long straight wire ppgpb*2o)tki 9 0ysw4flows in the upward direction as shown in the figure. (Elew)s*k4 yp20opg bti9pctron 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 wcl vg:mti d97 389bipqith constant speed enters a uniform magnetic field whose direction is perpendicular to the particle’s velocity. Thel7d 8 cb9gv9iq 3itm:p particle will:

  98.10: A charged particle wgn8mse 99:kyr5dz (zr ith constant velocity enters a uniform magnetic field whose:n(9y9edz 5grmr8ksz direction is parallel to the particle’s velocity. The particle will

  03.34: A positively charged particle of mas m9ng*pascd2.s M is at rest on a table. A non- zero electric field E is directed into the plane of the g2cp* amn9d .stable. 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 co qg;ru/y0c/ sioc8sxdr+ -u4znstant 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. Whato4y s-iu/ds8cc 0x/qzurr g+; is the direction of the electric field in this region of space? Ignore gravity

  04.14: A positive electric charge of negligible weight is relea*abhm52u wo4 ysed from rest between the poles of a horseshoe magnet as shown. What would be the direction of the acceleration of the ch5 wmaoy2 4b*uharge caused by the magnetic field?

  10.26: An electron movin stk3oxc(m zc:5,ltc9(u v wb)nj*n2wg in the plane of the page at an angle of 300 to the horizoncw3n29mn5 zc()w b jkc, :(ux*otlsv ttal 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 on the electron?

  11.29: An electron movesm-k k,m,vg9t /1jp1snq0ga xa with 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 i zd9yrd5o6f: 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 isfr5 d:6dyz o9i 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 abpvh3fq6ag 9fj : j/+and is deflected into a path with a radius of curvature R. If a second ion has speed 2v, while m, q, and B arjp9 h+3 6agj:fvbqa/fe unchanged, what will be the radius of the second ion’s path?

  16.44: A proton moves in (9p+ 8hh j6l3kpkw v(rejxol4a circular orbit in a uniform magnetic field B. A helium nucleus moves in a circular orbit in the same magnetic field. If each particle experiencesk h(jro3epvx9h+84jl l6(wpk 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 magnetic +u k2;dk vl cu6)9mzphaw9s9yfield. The ions carry the same charge and have the same path radius in the magne udy 9mckp6s9a hkwz)uv;+9 2ltic field. Which of the following quantities must be the same for the two ions?

  02.15: A positively charged particle moves to the right cq. d+eg a x7sz :bjfu01)k6e4dskmt ()zxpn(. It enters a region of space idxux )4. kk)qc(t7gz jesne 1fsp+(dmbaz6 0: n 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 velocity?

  96.40: A proton of mas8sd1xsclbg j r st:7,8s 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 commonly dabcx* sz 39g9setermined byag99*cszxb s 3

  09.27: A proton moves straight up the plane guk(:x,zs t4a4qyn0 f 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 there be a component of electric field? In,0 agqszy4tuxf4(k: gnore gravity.

  08.36: An electron moves in the plan wxg;7r:e5b ome 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 sme7wr5g:b ;ox hown). 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 win uw;l i,u*2wqth constant velocity through a region of space conta2nwwu i,*; ulqining 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 i5 qp2vt4wogb14 f)8lz.sc s,in ot;af5wq(fdirectly between two long straight wires. The conventional currepff(5fn5)oa sw28w 1lo t,bvstq4.q;z gcii4 nt 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 that exist at the location of the electron? Any electric field in the region originates from an unseen external source.