09.18: A wire has a conventiontuwn 9o4oz; kzy/9dug(()g uoal current I directed to the right. At the instant shown in the figure, an electron has a velocity directed to the left. The magnetic force on the eleck9u;(n4zz )(yuoguwt/gdo 9o tron at this instant is

  14.24: For the bar magnet shown in tzt5hq( rkx3 /rhe figure, which choice best describes the direction of rq3/ tx5hz k(rthe magnetic field at the point P located directly above the center of the magnet?

  11.34: A wire lies in the planehzu l,(m05i0 mm aqar; of the page with conventional current I shown. At the rm ;mau qih5(az0,ml0 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 t kx 4t2 ) e llcb.x1tsigaxpp3+9sto*:he left in a wire as shown. For the proton moving toward the top of the page at ti2bk:txpce3+*)a41 9lls tt pog x s.xhe instant shown, what is the direction of the magnetic force on the proton?

  94.30: The conventional 8vz/ a*)tdkg b8pi4 oucurrent I in a long straight wire flows in the upward direction as shown in the figure.*i4zgapvd 88ku/ tob ) (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 parcfaoj52-9y rq3i o5 b *mnjb1yi( xe6zticle with constant speed enters a uniform magnetic field whose direction is perpendicular -6aoi3 yzejjm2qiy5 5c1 no(x9b br*fto the particle’s velocity. The particle will:

  98.10: A charged particle with constant velocity enters a uniffjwy;9r ,r6li7mp6 lfpvt;0 norm magnetic field whose direction is parallel to the parm0r6 jwnl l;yp rtiv7;f6f 9p,ticle’s velocity. The particle will

  03.34: A positively charged particle of mass M is at rest on a table. A 5p/zan3lkv (p non- zero electric field5 np3l/a zvkp( 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 non-zero velocity in a region of spacmhn5a1 pl5kk- e 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 region of space? Ignoreh-ka55 n1klpm gravity

  04.14: A positive electric charg5du(gz cmllig + ct*2)e of negligible weight is released from rest between the poles of a horseshoe magnet as shown. What would be the direction of the acceleration of the charge caused by the maglt)md2+ uc gc*ig5l(znetic field?

  10.26: An electron m loq ovf(0)b8doving in the 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 of the page as shown. At the instant that the electron enters the magnetic field, which best describes the direction of the resulting magneti80 qblv(d)o ofc force on the electron?

  11.29: An electron mr rr;6,fjfo6 poves with 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 chab(33yeisar. erge −e and 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 circle. What is the a3isrb.e (e3aymount 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 magnetwgf6- t:cal 1bic field B and is deflected into a path with a radius of cc glawt:1 -b6furvature 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 orbit in a uniform magnetic field B. A he8wk2gp (s qfys88wj au(i+rcku4) v8 elium nucleus moves in a circular orbit in the same magnq8kuwa8i8s8f(j4 r(wycv2 )suk+gep etic 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 perpendicunh+lh6mon0(n o7 duh0lar 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 shmuoo6h h 7(n0lnd 0n+ame for the two ions?

  02.15: A positively charged particle m/ud qe.3b q/+pmogf+f oves 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 magupd+o+bf/eq/3f.q mgnetic field have to point in this region so that the particle maintains a constant velocity?

  96.40: A proton of mass M and kinrhjz8gm+8 nf(yf 5v/w+k acy o hn(w 4yke-3.qetic 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 electrindhjk v* -*1zok 1agb*-c s.fscally charged beta particles is commonly determined bya*kdsfjs*- gcho*k1nb z1 -v .

  09.27: A proton moves straight up the plane of this page into a regio ;3 ;2mfrjds:) f 3efzfba2ipqn 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 electric field? Ignore gfd;jz2qs eb 3m3i);:rf2f fparavity.

  08.36: An electron moves in the plane of the page through un8a6t: xsf-*lccoy (two regions of space along the dotted-line trajectory shou f:lync8a( t6 c*ox-swn 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 regg2ym dnkir z q5z04;6mion of space containd r;02mn5i4zg q zmky6ing 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 moves at constant non-zero velocity directly betwai .6abpjk,u 2een 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 b6a.au2 ,ipjk, 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.