09.18: A wire has a conventional current I directed to the right. At the 8r a)fdz)p2du;gav d.instant shown in the figure, an electron has a velocity directed to the left. The magn d2z g)a.8ra;vudp)dfetic force on the electron at this instant is

  14.24: For the bar magnet shown ic8 b,ntqdn:c +n the figure, which choice best describes the direct nt+:bdc8q c,nion of the magnetic field at the point P located directly above the center of the magnet?

  11.34: A wire lies in the plane of the pan 9.o/az7umud ge with conventional current I shown. At the m /u79aduonz.instant shown, what is the direction of the magnetic force on the electron that is moving directly to the right toward the wire?

  13.30: Electrons flow to the left in a wire as shown. For the p-/ kdxlbn1ek ,roton moving toward the top of the page at the instant shown, what is the direction of the magnetic force on the protd n,/ 1xlk-kbeon?

  94.30: The conventiona,w7ur8le/w olhj, ngrk : 5fe 793pqdgl current I in a long straight wire flows in the upward direction as shown ndlljr7q 7per39g,/ fgwk5,: eu8whoin the figure. (Electron 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 with constant speed j u1zlke: d:45dregz34h ;di nenters a uniform magnetic field whose direction is perpendicular to the particle’s velocity. The particle wi:r4 e dk 5dz1igzjdeh3n:4u ;lll:

  98.10: A charged particle with constant velocity enters a unifolqezf kqr,1 kt *o h-4vyd:cm w*95j/iq.k)jirm magnetic field whose direction is parallel to the parqzk 9 di:/w* yojiflqrv- ,ecm*1t5)kjk4.qh ticle’s velocity. The particle will

  03.34: A positively charged particle of cvp*mj(brd (+ 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 magnetb v (mdcrp*(j+ic 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 non-zero vee.ta2y lw7/ sk-j8yqmlocity 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 this rleywtkas72 -q8 ./mj yegion of space? Ignore gravity

  04.14: A positive electric charge of negligible weight is released fromime gf.x,qjp i npox1g 34,(3y rest between the poles of a horseshoe magnet as31eg, ig j 3x pfmoi(4nxq,y.p shown. What would be the direction of the acceleration of the charge caused by the magnetic field?

  10.26: An electron moving in thhpcg+96f0 upd e plane of the page at an angle of 300 to the horizontal enters a region with a constant magnetic field directed horizontally in the plane f6g9p d0+phuc 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 witj)3 ;5fgqme0 kibcr j8,fmjh 6h 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 sp -wr923 rvlh6n omynl ggd;9e-eed v in a plane perpendicular to a magnetic field of magnitude B. The electron follows a circular path 6nl3 -onwr;2lgr-9 e 9mvdygh 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, bn*qhf. 8.rz vs; hiaymg5go:w /42te 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, what will be the radius of the sec wq8bh:yi 4nag..h2o; s5m rgz/ev*tfond ion’s path?

  16.44: A proton moves in a circular orbit in a uniform ma2 8 v :hd,eivsmurp2j.gnetic field B. A helium nucleus moves in a circular orbit in the same magnetic field. If each particle experiences the same magnitude magnedeuv,r8sp mi j2hv.2:tic 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 thei :2 me8s(wdb7ssky1 w +lw)nh same uniform magnetic field. The ions carry the same charge and have :m(sk8yw)w2sh esd1+biwl7 n the same path radius in the magnetic field. Which of the following quantities must be the same for the two ions?

  02.15: A positively charged particle moves to the right. It enters a reg;*l kgwti (-f7pcz6 tdion of space in which there is* gilp(;t7 6-cft wzdk 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 mass M and kinesrk r:odt*l hrd;nh 5y16b95etic 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 commonlag ftv:lgk*r, 4 mo*r;y determined byat;fr v l*r,k:g gmo4*

  09.27: A proton moves straight up the plane of this page into a region thayp(0sdp5rx 5 bqt6nyfe-lk c6k4y1u5t has a magnetic field directed to the right. If the l5syx-tu(f166y54 e b5 knq0prdcy kp particle is undeflected as it passes 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 the page through cb -+9n qh 8uzf3x*fixifanfr(/;n t-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 shown). There is no electric field ff t8--nrx3xb*nz unf9af(ic iq;h/+in Region II. What is a necessary direction of the magnetic field in regions I and II?
Ignore gravitational forces.

  12.36: A positive chaqaztk58g , rbpw:f09erge moves with constant velocity through a region of space containing b pb9k50r:ezwq afgt, 8oth 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 betweed4 rcu3 4 xy7*r6cpawxn two long 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, r rdwaxp6u7yc4 3*cx4 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.