09.18: A wire has a conventional current I ,:j8rzvqt9 aedirected to the right. At the instant shown in the figure, an electron has a velocity directed to the left. The magnetic force on the electronazt rqj e:8,v9 at this instant is

  14.24: For the bar magnet shown in the figure, which choice best describz ,xgr-(ph:y qes the direction of the magnetic field at the poirg( xqz:h-y ,pnt P located directly above the center of the magnet?

  11.34: A wire lies in the plane of the page with conventional current I shown. A6gw, 3lxjais 9t the instant shown,9a63 w i,lsgxj 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 shownozglxs(w+5y u 20d zj8pf k:lq57s8 fq. For the proton moving toward the top of the pageyq5k5 (sfl+w 2gspz8uo dqjz708fx :l at the instant shown, what is the direction of the magnetic force on the proton?

  94.30: The conventional current I in a long straight wire flows in the v5e+ z9 az(a7z8cd udz9sgg-b upward direction as shown in the figga v zcug z8-d+b5zszd9 9e7a(ure. (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 enters a uniform magnetxqf1*r1brzthi -x,.k ic field whose direction is perpendicular to the particle’s velocity.btk x1fi.* -h1,xrrqz The particle will:

  98.10: A charged particle with constant velocity enters a uniform3w1h1ghsr4yc; 7ywy q magnetic field whose direction is parallel to the particle’s velocity. The party3;c1yhw7h s r1 4yqgwicle will

  03.34: A positively charged particle of mass M is at rest on a t7 (:t nlz 1yhjidbz,/k(s,fueable. 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 is true about the magnituz 1izt(:uk(edsby ,f nh, 7/ljde 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-r1 hnddr29 rgd.k0ogq5 +v2brzero velocity in a region of space that has a uniform1+gn orr dk v2r .b0r5hgd29qd 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 region of space? Ignore gravity

  04.14: A positive electric charge of negligibqcg5j -n6bdjw*ze:+amb p +f:anoa * 8le weight is released from rest between the poles of a horseshoe magnet as shown. What would b5-+wjanq:cop b+dzm*6aan :* e j 8fbge 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 an angle of 300opr9,)lsicsz+x/d / d to the horizontal enters a region with a constant magnetic field directed hord sr )z+i/9c/ods,pxlizontally 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 with sm*gt)tm wi.a x;g 5/a9g xnn;ypeed $1.00× 10^3\: m/s$ 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 and21i-lje(s8 opnf6) gn:c jrnh mass m travels at a speed v 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 the circle68n :f)ijnnh1og-jscp (2 ler. 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 7 ec6jym0xhb 8ow (al) wh2-usenters a magnetic field B and is deflected into a path with a radius om 7by8hs- ahclxw e2o0uwj)6(f 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 orbits4ml m60gmyky 86zbz : in a uniform magnetic field B. A helium nucleus moves in a circular orbit in 4b6yyg z0ls km68mmz :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 magne7;p w/ v6zunafnju8 /xtic 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 the twovzx7/a n8 nfpj6u/u;w ions?

  02.15: A positively charged particle moves to the right. Iy;m -mtt-mrb+i -1*6kwycxn ht enters a region of space in which there is an electric field directed up the plane of the paper (see figm+- t- 6;1ymrnbhxc - ywk*itmure). 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 kinetic jr+dj cjwag.da ma:0(f 5+l+qenergy $E_k$ 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 electricax -h(v;ium9ct snhq6c td+e,1lly charged beta particles is commonly determined bnch 9 sv(m6-eixd1th+qc,; uty

  09.27: A proton moves straight up thetm0pb99dood5x o x:dip v (p09 plane of this page into a region that has a magnetic field directed to the right. If the particle is undeflect0m9:5v oxp0o xd 9(p9t didpobed as it passes through this region, in what direction must there be a component of electric field? Ignore gravity.

  08.36: An electron moves i.u pq gri;rd64n the plane 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. Wrur;d i .pq64ghat 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 region of spaceqz 98r.( +fwwmy5e sex containing both any 8wmr.qx w +5esz(f9e
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 df/-gvxf,hd 0yirectly between two long straight wires. The conventional current x-hy fdg/vf0,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 originates from an unseen external source.