09.18: A wire has a conventional current I directed to the8quk kz/ vzc:s/o vu lrh2jca*/ t8/4j 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 in8/8/zkvjqcuv 2 rhoka*:/czu/4l tj s stant is

  14.24: For the bar magnet shown in the figure, which choice6 ry.oqz)yb3i6x1sk-mwhk gmn )wg 7k8l )5 mm best describes the direction of the magnetic field at the point P located directly above the center of thes8i mbw 6kny5ymo wr)1mg qk )mk-hl376z.xg) magnet?

  11.34: A wire lies in the plane ft,//apd1 0s6qlqcwl of the page with conventional current I shown. At the instant shown, what is the direction of the magnetic force on the electron that is movinaqcd qpt/ ,slf/60w1lg directly to the right toward the wire?

  13.30: Electrons flow t f*a./vt-4cqe efs)cw o the left in a wire as shown. For the proton moving toward the top of the page at the insta cefa)f *-ct/vs4 .qwent shown, what is the direction of the magnetic force on the proton?

  94.30: The conventional current Ia0 3h+v (4mr*cja zxu ks/x1vh in a long straight wire flows in the upward direction as shown in the figure. (Electron flow is downward.) At the instant a pjachr(s v +3aum xh*/kz014xvroton 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 unifor 5hvczbc.::a cy.ql1nm magnetic field whose direction is perpendicular to the part.a qvhcbc: .nl1y: z5cicle’s velocity. The particle will:

  98.10: A charged particle with conoau31 x7s 1vjml8.hoqstant velocity enters a uniform magnetic field who11.sjmoauohv37lx 8 qse direction is parallel to the particle’s velocity. The particle will

  03.34: A positively charged particle of mass M is at rest on a 8sb rqa13+jn ntable. 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 irb18+ jnq3a sns 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-zerrime7pu pz1ork.pd7y /w6n38 nr(- rjo velocity in a region of space that has a uniform magnetip73o 6-y1.(j i8pr edp/rmk nrw7zunrc 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 negligible weight is rea e9a0u-f6 sczleased from rest between the poles of a horseshoe magnet as shown. What would be the direction of th- ec6 za9s0afue acceleration of the charge caused by the magnetic field?

  10.26: An electron moving in the plane of the page atazxeofcw,t( / 0cyku(t(k (6 l an angle of 300 to the horizontal enters a regkz (cyox uet6t/a(( f0wkc (l,ion 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 moves wit ; a+2tg(5.k r tamopfpsr)iu(yg)jt-h 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 in a*39ciivr cniyi*jo(kq , 7 u)-0 nho1dz:ercc 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 el:cy0crv*z1,7u rq 9ce *-n jio noic dhi)3ki(ectron in this time?

  97.28: An ion with char28czy/hnf5, b izwebjf6 k *d6ge q, mass m, and speed v enters a magnetic field 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 unchanged, wha 5i*6en z8ch/bjbw 6f,d2z kyft will be the radius of the second ion’s path?

  16.44: A proton moves in a circular orbit in 3lk/ent msqoy.5*o e/ a uniform 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 the helium tel*.ko/q/ tne3 sm 5oyo the speed of the proton?

  10.43: Two ions trave/f th6b-o:so*vgb5mql perpendicular to the same uniform magnetic field. The ions carry the same charge and have the same path radius in the magnevfot:qh*s-g mb5 /b6o tic field. Which of the following quantities must be the same for the two ions?

  02.15: A positively chargenx 2hqh,lxn k+my*ux*tu* 5 y/d 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 magnetic nxyyx5/u q l,t *2*x+hknm*hu field have to point in this region so that the particle maintains a constant velocity?

  96.40: A proton of mass M and kinetic, wimib7 7sio 2hr.dz87qrb3o 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 :zr4 j4 0xo5qt+w- nbgcy* qifcharged beta particles is commonly determined by*o 0 fwig-4xy4nc:bz+q qj5rt

  09.27: A proton moves straight up the plane of this pawml0 fs0 w)zb0ge into a region that has a magnetic field directed to the right. If the particle is undeflected as it passes through this region, in whatlw)m0s0 bw0 zf direction must there be a component of electric field? Ignore gravity.

  08.36: An electron moves in the plane 2y- )jgcg)dfx 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 plang y))-fj 2gxcde 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 wys; nr ,c2doe)vzt: g/ kf,iv(ith constant velocity through a region of space containing bot/svv ,r i)y;t e:o(d zknf,gc2h 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 between two lonc: 8wpygknaj8r 8k38pz (b id)g 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 that exist at the location of the electron? Any electric field in the region origin:8wib83 p(p nryd8cjzak8 )gkates from an unseen external source.