09.18: A wire has a conventional curre19mdh 2vuxlmc2b2)w 9lci; ;kbb w8ev nt I directed to the right. At the instant shown in the figure, an electron has a velocity directed to the left.l2v8wwi bbem2dx 1mb;u9v h;9 klc2c) The magnetic force on the electron at this instant is

  14.24: For the bar magnet shown in the figure, which0e .ctqs8m :j v0hur3a:5jeay choice best describes the direction of the magnetic field at the point P located directly above the 0y3tua8 jevh e :r 0.ms5aqj:ccenter of the magnet?

  11.34: A wire lies in the plane of the page with conventional current Itni( xg k0 oetwz9078o shown. At the instant shown, what is the direction of the magnetic force on the electron that is moving directly t7n89i0w xet0(z o tkgoo the right toward the wire?

  13.30: Electrons flow to the left in a wire as shown. For the proton movin :dqgr53i zzq/g toward the top of the page at the instant sidr z:q/g 5z3qhown, what is the direction of the magnetic force on the proton?

  94.30: The conventional current I in a long straight wire flows in y5d xt1y im +*hsk4qu1the upward direction as shown in the figure. (Electron flow is downward.) At the instant a proton of charg*yy1xqh4stm+ k5 uid1e +e is a distance R from the wire and heading directly toward it, the force on the proton is:

  95.16: A charged particl0vp5q8o1yg6r 7vg e vhe with constant speed enters a uniform magnetic field whose57y0 vvhoq816e p ggvr direction is perpendicular to the particle’s velocity. The particle will:

  98.10: A charged particle withirr6-zm3t3 ) )omblya constant velocity enters a uniform magnetic field whose direction is parallel to the po) m3a3btml-6ri)r zyarticle’s velocity. The particle will

  03.34: A positively charged particle of mass M is at rest on a tablkj3sp1lp r2 c;vpf;u1e. 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 partukfjrv spc13pl12; ; picle $F_E$ compared to the magneti force on the particle $F_B$?

  16.24: A proton moves with constant non-zerw d1nidnq)vk, )g8)c go 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 electric field in tvgd8)n ng,) wk)c q1idhis region of space? Ignore gravity

  04.14: A positive electric chan.m5s i(xe(oli 6*z0zcubo 4hojkw ;:rge of negligible weight is released from rest between the polb jzs oli h45cxz*o(nui;ko (: 6we.0mes of a horseshoe 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 thetbud9e nw;. 1kp(rgrf+j 07pk 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 magneg;rprk wujd.kpeb1nf0(79 t+ tic force on the electron?

  11.29: An electron moves wi0kmnohb8x// 2suzb 8p w 7ev:vth 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 ,ujd, uzw 9-i:yxyl 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 work done by the magnetic force on the electron in this time?,v ujywd9,uylz: xi .-

  97.28: An ion with charge q, mass m, w04l bz ptd2*ct9z2l 2di9 hlru :vvt/and speed v enters a magnetic field B and is def2t d 29tpzltud0 b:zrvwc*v4hl/l 92 ilected into a 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 field B. 2cx ef-wa7hvy+9nrpg l0 (:fwA helium nucleus moves in a circular orbit in the same magnetic field. If each particle experiences the same magnitudepg0-yn+a2:hr wf9 (e cf l7xwv 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 periv:t4(o f3yvi.j5dt+3pyoec y4 col; pendicular 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 quantities must be the sam3 tcv:ci54;3p4jyive (t.yl y+of ood e for the two ions?

  02.15: A positively char*2qfy14h b9a0wh1wkpq6d bciged particle moves to the right. 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 magnetbww yk f4p0 ic9hdqaqhb126 *1ic field have to point in this region so that the particle maintains a constant velocity?

  96.40: A proton of mass M and kinetic energy yj7r5d:imj ,bae4q +.xs0bzr $E_k$ 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 particlezk74iq3pm8 ck d8/bus.xz sm2s is commonly determined b s47mp8msci/uz 3d2 qbk k.8xzy

  09.27: A proton moves straight up the plane of k )iylw 1s(vy(t 5g f sis(9y8mrqc.5ithis 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 why kli9swq(s 5 )8(igmv5.tyiyc 1rf(sat direction must there be a component of electric field? Ignore gravity.

  08.36: An electron moves in the plane of the page through two regions of spaceon*fog j51sjm.4te x 1ln 6ta6 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). Thaojol54fm.j1 tsn*te6 gnx6 1ere 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 constantt8bf )25 2 hhnh,hsxad velocity through a region of space containing bo2 tfab 2hhxd,)h 8shn5th 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 xg hv:qe a(v-,lzvh,2at constant non-zero velocity directly between two long straight wires. The conventional current in each wire has the same magnitude,x ahz-2:, v,l gv(ehvq 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.