09.18: A wire has a conventional current-.4y2 1nfavj3elf/dq3g(b v 9 szhion 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 this instant i blehv.9o3q4n/3(-fa21yigndvz sj fs

  14.24: For the bar magnet sf-+yqufew /3wa76lxqhown in the figure, which choice best describes the direction of the magnetic field at the point P lo a3/xlw6y fuqfq+ -7ewcated directly above the center of the magnet?

  11.34: A wire lies in the plane of the page with conventional current I sh /tvb( .i8rl;qv;1 p;vgpis whown. At the instant shown, what is the direction of the magnetic force on the electron that is moving direct; 8i psvh ivp/ 1t;bvwgrl.(;qly to the right toward the wire?

  13.30: Electrons flow to the left in a wire 9t rf:0qpilgfy qrk 63, x 4jpp-8(rbbas shown. For the proton moving toward the top of the page at the instant shown, what is the direction of thekp3itg(,j84-6 :rl9bx f pyqfbpr0rq magnetic force on the proton?

  94.30: The conventional current I in a long straight wire flows in the upw x,gs/:ststl 2ard direction as shown in the figure. (Electron flow is downward.,2l/ttgsss :x) 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 sp+ ;rqo,:5kz ) vmtfxsmeed enters a uniform magnetic field whose direction immt +5qo;r, )z fkx:vss perpendicular to the particle’s velocity. The particle will:

  98.10: A charged particle with conyju i-v9pog5o 26f*-c0gkzk/qk9toykt f ,. x stant velocity enters a uniform magnetic field whose direction is parallek/ - jk ufg0okotx56fp 9k-z. gvqic2yy*o9t,l to the particle’s velocity. The particle will

  03.34: A positively charged particle ofi/(xsqpw,(g7 p)qzwe 0 vx5dh 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 dix zg(qq )sp/v hxwed57iw(,p0rected 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 constant non-zero velocity in a region of space t/fu)czwo2 6lx hat has a uniform magnzwc26/) ulf oxetic 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 .jp9 57jlugqhnegligible weight is released from rest between the poles of a horseshoe magnet as shown. What wouldh9glq5ju7 . pj be the direction of the acceleration of the charge caused by the magnetic field?

  10.26: An electron moving in the plangyao-uqpzq1/2f* ;bu k o htf2kcwjz ;( 9n;8ne of the 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,/qojp ucf ktqgz;nf2;oznh k*2(1uyb8;9a w- which best describes the direction of the resulting magnetic force on the electron?

  11.29: An electron moves with spv),mmuv;1 i a aj4rhi0eed $1.00× 10^3\: m/s$ 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 speedjub 95w2iqsv6 +vwyetzl 9:p2 v in a plane perpendicular to a magnetic field of magnitude B. The electey69vs2l p9:2iuqjtv +w 5zwb ron 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?

  97.28: An ion with charge q, mass m, and speed v enters a magnetic field xgtotz 5nq4ye :qb(2ubs/**f B and is deflected into a pq /eq f4(xbyut bst:z*2n*5go ath 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 vu45l 12t3tnmav zme7field B. A helium nucleus moves in a circulaa7ml2v1 5zun4 etm3vt r 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 the helium to the speed of the proton?

  10.43: Two ions travel perpendicular to the same uniform magnetic fie 6opykkjj1da3+uy 4b,ld. The ions carry the same charge and have the same path radius in the magnetic field. Which of the following quantities must be the same for the twoyk4y61k jpa udj+3o b, ions?

  02.15: A positively charged particle myy*)evc eji8ndpu 924oves 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 magnetic y8n4cde *ve y9ju2p )ifield have to point in this region so that the particle maintains a constant velocity?

  96.40: A proton of mass M and kinetid2vx2bty) iv02xp 2sz c 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 chargedjrr rp4df4*n 1 beta particles is commonly determined byfd4pr1j 4*r nr

  09.27: A proton moves straight up the plane of this page into a regioyxf0*+nafigb/ /dkcsr) +g:sn that has a magnetic field directed to the right. If the particle is undeflected as it passes through this region, in whxikn +*dcy: rsb/a)fg /s+gf 0at direction must there be a component of electric field? Ignore gravity.

  08.36: An electron mo+ t0yc*i:cxs pves in the plane of the page through two regions of space along the dotted-line trajectory shown in the f ys: t*cp0xc+iigure. 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 movv3ewu 6z0nr .hghhc5( es with constant velocity through a region of space contaighnzrv3hu 60 c(we5h. ning 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 betyr du2u qc8+x7cp3 i,b-rqn/lween two long straight wires. The conventional current in each wire has the same magnitude, but the currents are in opposite directions as shown in ther ,ly7c8qb /q-udxp3i +cr2 un 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.