09.18: A wire has a conventional current I directed tc) h/uwr3ucij (l+ rj*o the right. At the instant shown in the figure, an electron has a velocity directed to the left. The magnetic force on the electr cj)u3r ljw/*uh+c(iron at this instant is

  14.24: For the bar magnet shown in the figure, which c.x4q bwg5ufumaq0 7l,hoice best describes the direction of the magnetic field at the point P low u,ufqal qx5m 047.bgcated directly above the center of the magnet?

  11.34: A wire lies in the planeqn fj6r7.r60 o: chmzm of the page with conventional current I shown. At the instant shown, what is the directi 6rmfc.z6hmo7j0r:qn on 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 wit lis3: l9 hzil9o8+oj*mp,t nre as shown. For the proton moving toward the top of the pa+m 9ois9:83hljt ip* zlo, tnlge at the instant shown, what is the direction of the magnetic force on the proton?

  94.30: The conventional current I apf4gulm86 ( z/sq r:qin a long straight wire flows in the upward direction as shown in the figure. (Electron flow is downward.)gumqs fl(p:zr4a/q 68 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 r*:3js - fzzztenters a uniform magnetic field whose d jf-szz* 3tzr:irection is perpendicular to the particle’s velocity. The particle will:

  98.10: A charged part j4,s jsu uuoi9,a5+iticle with constant velocity enters a uniform magnetic field js59,4uoaiutu js+,i whose direction is parallel to the particle’s velocity. The particle will

  03.34: A positively charged particle of mass M is at rest on a d+3mh 5 (a7wo/y zz zde.nd0sdtable. A non- zero electric m /nzzhd7a+wo .zdy edd 30s(5field 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 spaceot;xb cww7*k8 that has a uniform magnetic field directed into the plane of the page. The pro owt bwc*k;7x8ton 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 releasece9,r+zwj /evh:l* izvv+v7n d from rest between the poles of a horseshoe magnet as shown. What would be the direction of the acceleration of the charge caused by the7r*+ln we,vzvzjc: ivh e/v+9 magnetic field?

  10.26: An electron moving in the plach77 re sro:um:0 jhr1)p qu:dne 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 enterrurq :7ohjpdcm:)s71h r0 :eus the magnetic field, which best describes the direction of the resulting magnetic force on the electron?

  11.29: An electron moves with spea1 xow-yul s b1m6e3h/ed $1.00× 10^3\: m/s$ 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 masqmn,sjovvmu/1 w07 .04tv i wks 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 amount of work done by the magnetic force on the elm4i,o/twv1kv .vnqjs0mu0w 7ectron in this time?

  97.28: An ion with ch2g9 xk+vvl w-oarge q, 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 thexlv9+w-o2v gk radius of the second ion’s path?

  16.44: A proton moves in a ye i3zz578cb )j egn7ccircular orbit in a uniform magnetic field B. A helium nucleus moves in a circular orbit in the same magnetic field. If e cn gjzy7)ezb 35i78ecach 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 magnetic field. The 5k 19eew5fpzt.v.cgl4ae n: r ions carry the same charge and have the same path radius in .e9kfcer: 4at5n5 1z.vgp wlethe 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 entog: ,2jj2ixrlenqp x214itn/ ers a region of space in which there is an electric field dp lor2ge x1,itnj2xn 2j /qi:4irected 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 kinetic energ5pu r9a:lg.ik y $E_k$ 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 commonly dnk)+,t8 gg3z v/uzrujev ly a07/dm a/etermined byayln /zg7kzrv ,u/mj /eutd8 va03 g+)

  09.27: A proton moves straight up the plane of this page into a regioeuletf19j* m39dkg j2a. mv5ln 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 compdv92 *am5 jk1 lfj9eeutg ml3.onent of electric field? Ignore gravity.

  08.36: An electron moves in the planexb4*1mr:hb3fll1f 2 4o hfyjl 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 lj4r*fy3 lbhl 41m21bf hofx: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 cons.q.rj ey*z9a0aek*bv9.g pl ttant velocity through a region of space containingz*k9qat.pey .j* g re.bv9al 0 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 constantzj-ry0 /.nmtifb0- e g non-zero velocity directly between 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 direction of the magnetic field and the direction of the electric field that exist at the location of the electron? Any ele.my - rfbt-zji0ng0e/ctric field in the region originates from an unseen external source.