09.18: A wire has a conventional current I directed to the right. At the inskedd m-2/ufgpg8g5oi -ap 6 z kk0u2,htant shown in the figure, an electron has a velocity direcu0o ud 6zadk8p,g-pf-kg 2g2/ekh m5i ted to the left. The magnetic force on the electron at this instant is

  14.24: For the bar magnet shown in the figurns(vcq+yz*8z e, which choice best describes the direction of tzv (s8z n+q*cyhe 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 conventionayqv)onv;;glmlsd1a( )-+vel8/ jqn yl current I shown. At +n)vgyvv q1/e ;;lq8l)(ny-mosj da lthe 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 wiragd; *( .ykqzje as shown. For the proton moving toward the top of the page gzq;y* .akdj( at the instant shown, what is the direction of the magnetic force on the proton?

  94.30: The conventional current I in a longfxy-d1ih drb iv5. sh9( rl99s straight wire flows in the upward direction as shown in the figure. (Elect.(diihh9 l5-r9 d fsxyrbs1 v9ron 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 witw01 gghe.)w 8 yioqjz;t;yf+n h constant speed enters a uniform magnetic field whose direction y ow.w1nt)jziye; gqf+hg 80;is perpendicular to the particle’s velocity. The particle will:

  98.10: A charged particle with constant veloci 53 mpayzrj z .hnm;r*7:mb+ noive.u1ty enters a uniform magnetic field whose directivzu mi175. ny+ej*; p.a:rmnr bmzh3 oon is parallel to the particle’s velocity. The particle will

  03.34: A positively charged particle of mass M is at 7f fmk1x+7 wmllpn;,y rest on a table. A non- zero electric field E is directed into the plane of the table. A non-zero magnetic field B is dimy1 l+ fl,f n7mwpxk7;rected 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 consta k /t3hmd.nkmj;u..mhv*mn 6s3-ve )aarpa g7 nt non-zero velocity in a region of space that has a uniform magnetic field directed into the plane of the page. The proton moves directly up the plane3m aankd..;e m-urhp)* v mn/3k .h6gvsmajt7 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 released from rest betjg :bfo 804a49mqowxuween the poles of a horseshoe magnet as shown. What would be the direction of the acceleration of the charge caused by the magnetic fie:4o qufwbgj0a8o m4x 9ld?

  10.26: An electron moving in the plane of the page at an anglamj k/fc)fg *0x +qj5qe 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 direcjfq0 a)f/gjm *5cq+kx tion of the resulting magnetic force on the electron?

  11.29: An electron moves with u +(he/o ,ef+e8p)6)j pzyh5l ou( ddddql4mr 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 +sx 2q,gpf:bw −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,x2g sfp+b: qw 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 ahtdq3q:sxo5fiq,nr5 v,8 z6s nd 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 radiusdz:o i,5r hfvxtq8q 3ssn6,5 q of the second ion’s path?

  16.44: A proton moves in *( n*isrk1repu uq5u-a circular orbit in a uniform magnetic field B. A helium nucleus moves in a circular orbit in the same magnetic field. If each particluk u 1(rr uqs5-*ni*pee 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 perpendicularm:yh+ xalfjo -jg9p4, to the same uniform magnetic field. The ions carry the same charge and have the same path radius in the magnetic field. Which of thl j :+aog,-jpyxm 9f4he following quantities must be the same for the two ions?

  02.15: A positively charged particle moves to the right. It enters a region of stwrtlf+ zhm;4fwi z0k- b5 .,cpace in which there is an electric field directed up the pllwcmti,w0+4z .z k -hb f;f5trane 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 kineti8mw/dsk q :5vmc 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 commong)s,jx y0kw9p w:5cv fly determined bvcwkjp9y0g 5f w,s):xy

  09.27: A proton moves straight up the4 n )pdfv;a 0o,2zk cmvk(r*sem6, ibp plane of this page 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 directio 64k 2(maen ck,rv pfo)si mp;0v,dzb*n must there be a component of electric field? Ignore gravity.

  08.36: An electron moves in the plane of the page through two r jizrg6/0r hro7ae -c0egions of space along the dotted-line trajectory shown in the figure. There is a uniform electric field in Region I directed intorzaoh0ci0/ejr rg 67- 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 throu7 csof/v5y 1ohfiry 8-gh a region of space containing yci8oh/1ffs-r7 v5yoboth 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 zsddff8q3* 7z constant non-zero velocity directly between two long straight wires. The conventional current in d783zs dz*ffq 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.