09.18: A wire has a conventional current I directed tovj sdl: d3 eck3()ugy+ the right. At the instant shown 3u egsykl dvj+d(3):c in the figure, an electron has a velocity directed to the left. The magnetic force on the electron at this instant is

  14.24: For the bar magnev2a bct /df4;/xi )fktz :aaq(t shown in the figure, which choice best describes the direction of the magnetic field at the point P located directly above the center of ; dqav )tz(/aix ffac:/tk2b4the magnet?

  11.34: A wire lies in the plane of the pandp + qav-k z)1k.kuy4ge with conventional current I shown. At the instant shown, what is the direction of the magnetic force on the el akupk4kdz.vq) yn+ -1ectron that is moving directly to the right toward the wire?

  13.30: Electrons flow to th ,t7e2 l(nkz:gz0hi yigf29 nte left in a wire as shown. For the proton moving toward the top of the page at the instant shown, w:zt0g7nn (iy9 2g, e h2ftkilzhat is the direction of the magnetic force on the proton?

  94.30: The conventional current I in a lonbew j(-iz jpn*fv40-bg straight wire flows in the upward direction as shown in the figure. (Electron flow is downward.) At the *jp f j4-zb-b e0vwin(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 speed enters a uniform magnetic f( z :u.39l)btch9y ye ;rhohbw;e5yd uield whose direction is perpendicular to the particle’s velocity. The particle wil: hyl5; h eue. o9d3r9( hybu)tyz;cwbl:

  98.10: A charged particle with constant velojc w(2l8oh is-city enters a uniform magnetic field whose direcl82j(-wi chos tion is parallel to the particle’s velocity. The particle will

  03.34: A positively charged particle of mass M is at rest on a table. q7o -4xn mpdz3gkd, x(A non- zero electricd-z7nomx kq,gp3x d 4( 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 particle $F_E$ compared to the magneti force on the particle $F_B$?

  16.24: A proton moves with constant nonx i*c45s3 7( cnbqvdzz-zero velocity in a region of space that has a uniform magnetic field direc* vd5z ccix4qsz37b(n ted 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 rele3m4sd29r fq.fdzn qk-ased from rest between the poles of a horseshoe magnet as shown. What would be the direction of the acdnrkff3-.ms q 42 9zdqceleration of the charge caused by the magnetic field?

  10.26: An electron moving in the plane of the page at an r- wy28 k5we tj8y3jtkangle 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 ele-538ektyjwtwy2j rk 8ctron enters the magnetic field, which best describes the direction of the resulting magnetic force on the electron?

  11.29: An electron moves z j,oj,.aq3,bg 9+xmbblib.qwith 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 vgr jv7z0wxz* cr6i7- u 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 th7zw gr zi*r06j- xc7vue 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 mgx ,xvv4yagh c a3a eb16.,4vs, and speed v enters a magnetic field B and is deflected into a path with a radius of curvature R. If a secoxbvhea143,a xa 4vv.c6sg,yg nd 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 orbfl 3 n) :7z34sd;olv0cx xrebrit in 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 heli;r :rv nf3x)b c40l3esdozl7xum to the speed of the proton?

  10.43: Two ions travel perpendicu . ou8rb8wjsz;lar 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 same for b8row uj 8z.;sthe two ions?

  02.15: A positively charged particle move8t z rm0g*s5hjs 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 directit5g j8 hzr*ms0on does a magnetic field have to point in this region so that the particle maintains a constant velocity?

  96.40: A proton of mass M and kineti*sxa0:wx 4zob+oddn5 q v4o9p 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 chargegzod-::nljq bj1 9m ib97vi/3rht: tg d beta particles is commonly determined bhr93j /:jtzglm nibbg :v71id9:ot-q y

  09.27: A proton moves straight up the plane of thisz-/1j; la8e wwmb7u:gum;2b3 2 uyzec g4fgfk page into a region that has a magnetic field directed to the right. If the particle is undeflected as it passzgm z1m4a;ubej7gw8bf -g3uu:;22f clkw / eyes 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 the1c+4hzy 6b1zx ndj+ccj q67kh page through two regions of space along the dottek ncd1 bc4cjhzz1hj6x +7+6yqd-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 necessary direction of the magnetic field in regions I and II?
Ignore gravitational forces.

  12.36: A positive charge moves with constant velocity through a qmp u/ijf k3gt209+frudfk/ : region of space conta qg+rf2f f/9i:dt3uuj k0p/kmining 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 moo8 jfr9kmab0 9px .:92rz-b gz 2yjmf jc/vml*ves at constant non-zero velocity directly between two long straight wires. The conventional current in each wire has the same ml rj-/9pzj. 8km9b fvga02j by czx92*:omfrmagnitude, 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.