09.18: A wire has a conventional current I direpb0 9mu1s y0kwcted to the right. At the instant shown in the figure, an electron has a velocity directed to the0ukp1m9 y w0sb left. The magnetic force on the electron at this instant is

  14.24: For the bar magnet shown in the figure, which choice best de7yzt4: nzvm puxzv :y/2tc4 w4scribes the di z4v p4yntcm vzzuy:w/ :42tx7rection 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 conventional current I shown4e f1ucxzs m,0. At the instant shown, what is the direction of th0us,xz1efc m 4e 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 proton moving t/t75f/xh tyodoward the top of the page at the yx7/otdt 5fh /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 g6(1om t0r: pdz1filuthe upward direction as shown in the figo(6r 1 zfmti 1lgup:d0ure. (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 magnetic f9p) 7vxs)bwii;*lu,kqb i+h qield whose direction is perpendicular to the particle’s velocity. b+ bi pwk ;i*)qlxus)7ivq9,h The particle will:

  98.10: A charged paree*1,9+4 -)gzpgmzsh (8/rllm8dtxg k ppiazticle with constant velocity enters a uniform magnetic field whose direction is parallel to the particle’s velocity. The particle willktmdapg88 zrhiz(l pgge4 es1 9z*p -+)xl/m,

  03.34: A positively charged particle of mass M is h:x; 2*v qerbqv -lzh*at rest on a table. A non- zero electric field E is directed into the plane of the table. A non-zero magnetic f zq br **hlhv:xv;q-2eield 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 const5b wins 91x5eqant non-zero velocity in a region of space that has a uniform magneiw9x n5e51q sbtic 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 electriue; q3hwagy-o6 4+ hhuc charge of negligible weight is released from rest between the poles of a horseshoe magnet asgow;h h6hy3a4uq-u +e 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 wqi;f 6q(os i2 +rzt 5c;ih(qgpage 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 magneti f(zc twq6g q(q+s5i;i hro;2ic force on the electron?

  11.29: An electron moves r i+)y o bwosh)u5m-evza- +y)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 charge −e and mass m travels c10au mz34ymu at a speed v in a plane perpendicular to a magnetic field of magnitude B. The elecz1m3a 40uymc utron 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 electron in this time?

  97.28: An ion with charge q, mass m, and speed v enters a magnetic field kaw9mi n;+aapn8a), /ty(niz B and is deflected into a path with a radius of curvature R. If mytaw/kii; n( 9n) z+np8aaa,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 magnrcghg.w h9 *)cetic field 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 helg*rwch) h9c .gium to the speed of the proton?

  10.43: Two ions travel perpendic abpcr 3tjq3o:et1ywj.m9,* a07lmkyular 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 same for the two ions? . :*a3,1mctr ojyy 0tejbm w9pqla7k3

  02.15: A positively c/uzei5y0 izj h ,5yq/aharged particle moves 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).z5ui,zia/j5 q/ hey0y 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 kineticb xl u:+)n-w,k)vuhz)7aoshn 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 elecncz 12ymu87 g11po akqtrically charged beta particles is commonly determined b1n azkogpymu872 q 11cy

  09.27: A proton moves straight up thep.lu iz8 jh kc6mkw. zl:2dbt-c0(ol, plane of this page into a region that has a magnetic field directed to the right.2o.jkp hmuiz8w.lc:t zlb-6 (k d0cl, If the particle is undeflected as it passes through this region, in what direction must there be a component of electric field? Ignore gravity.

  08.36: An electron moves in the plane of the page through two regions of spac1s3g)xz0la)l qczy( 0c q5e v5qoi8 bee 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 magnetic field in regionslezqc) q oe0x0slqac bvziy(g 1385 5) I and II?
Ignore gravitational forces.

  12.36: A positive charge moves with constant velocity through a region ogv h8,8w,qopj hr7 m-df space cod8o p8rqgm j -h7,hvw,ntaining 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 vj 6 ea8ip)a92f rasr0jk-sph:elocity 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 electric fijfs:-6e2h 08 aij k)arpas9 preld in the region originates from an unseen external source.