09.18: A wire has a conventional current I directed to t u p1*w a/y9h8m:droifhe right. At the instant shown in the figure, an electron has a velocity directed to the left. The magnetic force on the electron at/a r* 8w9mophfy:dui1 this instant is

  14.24: For the bar magnet shown in the figure, which choice best d94mblj akq(4y .:say bescribes the dirabjlkm4a. 4 (9:bysyq ection 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 page with convno+fvv (r .ep+entional current I shown. At the instant shown, what is the direction of theevn( +o f+.vpr 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 ;ppb -6wmhn3p9w*bw hproton moving toward the top of the page at thew9p bpw3bm6 h-h*p n;w instant shown, what is the direction of the magnetic force on the proton?

  94.30: The conventional current. cx1l+hlr lg xj9,eryh)xk+- I in a long straight wire flows in the upward direction as shown in 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 pr -hx l1 .kycjl+g) l,x9e+xhrroton is:

  95.16: A charged particl4dm,cc-fh w x7;q- z dc1weeox*f92g ze with constant speed enters a uniform magnetic field whose direction is* cd29-gw7 f mwq;hc,4dzoexfx e- cz1 perpendicular to the particle’s velocity. The particle will:

  98.10: A charged particle with constamhiax)b* 8at p7x+ 5p.c h.vbznt velocity enters a uniform magnetic field wz+ 5h8h 7.*vb)bx.cppmxia athose direction is parallel to the particle’s velocity. The particle will

  03.34: A positively charged partiia-c)k* iy+c-lw4z phcle of 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 fiehcyzp*- i4)+wc la-ki ld 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 constan h 2ple4*bk u6x d0.yy.5wr) kysksn ln4o3,eot non-zero velocity in a region of space that has a uniform magnetic k)n2s4yhklk.eebp xl,sdwrn06y3u o. 5 oy* 4 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 rel: d*o c.p(buw(nrnz o4eased from rest between the poles of a horseuod (cpz n:ro b*.(4nwshoe 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 a .pv/k.yibix r z0:d:sn angle of 300 to the horizontal enters a region with a constant magkxi:b:./ visp d.zr y0netic 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 wiy ,ivm5;4q;qp hal t0*zig6zmth 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 xvnz nnis.(b)x/b8 j4 in a plane perpendicular to a magnetic field of magnitude B. The electron follows a circular path of radius R. In in8 nb/x)j4zn(vsb x.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 B 8 ohvm) gp(;qsand is deflected into a path with a radius of curvature R. If a second ion has speed 2v, while 8go;h(vp q)m sm, 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 fjs0odfwp:w*t /t9m e)ield 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 to the speed of the p*) e0t9wfwpoj/m:std roton?

  10.43: Two ions travel perpendicular to the same uniform magnetic field. The ig/u;d2c bml.dee;rmt3/pvl *h3 rp u4ons carry the same cc4m.2vd;rul3 /;ug3eh / btd p *mrelpharge and have 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 re/+-tvr qno qynp.-l5b gion of space in which there is an electric field directed up the plane of the paper (see figure). In which dir--tq+5r nb/p .nolvqyection does a magnetic field have to point in this region so that the particle maintains a constant velocity?

  96.40: A proton of mas71zcnme 9vr5e s M and kinetic 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 electricallyejvad3l* de/h2wp)- l charged beta particles is commonly determined bawe)* 2h/-d3 jdpvell y

  09.27: A proton moves straight up the plane of this pagsbze /bj*-su ;)r, *1giyapawftl7 7ee into a region that has a magnetic field directed to the right. If the particle is undeflected as it passes through this region, in what direction must there be a component of eba lysb7e /uwg*fiej)*7;pt - a,1zsrlectric field? Ignore gravity.

  08.36: An electron moves in the plan/ye t608 lqiv4d /cekse 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 plane of the page (as shown). There is no electric field in Region II. What is a necessary direction of the mag e 0ed84qc6 lki/tyv/snetic field in regions I and II?
Ignore gravitational forces.

  12.36: A positive charge move1wih7s 0xyhf1 s with constant velocity through a region of space containing bofhwy1i7x1 0h sth 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 betwee1wnwqy3yyz)hd . dh)7/ qo hx:n 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, which choice best reflects the directioo1:7 .d qyy3)nhzx)h whwdq /yn 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.