09.18: A wire has a conventional c .ty8rjuco4 ;qurrent 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 8oc;. ytu j4rqelectron at this instant is

  14.24: For the bar mags.zsllulj :qa)zw0 jl nf*-rd/07tc 4net shown in the figure, which choice best describes the direction of the magnetic field at the point P located directuawl.4tl lcjs /rf*zz-)0 q0:njl d7sly above the center of the magnet?

  11.34: A wire lies in the planen0e(29b7 ,si8jhzt9 paggl pf of the page with conventional current I shown. At the instant shown, what is the direction of the magnetic force on the electron that is mip0a2nb(8z jh7lg 9p 9e ,sftgoving directly to the right toward the wire?

  13.30: Electrons flow to the lef*-fz9 s,olbok0ir nfv*+,x uat in a wire as shown. For the proton moving toward the top of the page at the instant shown, what is thek*frv a xi0oo,u,lb* f-nsz +9 direction of the magnetic force on the proton?

  94.30: The conventional current I in a long straight wire flows in 3 d7plx9yfcj8 /g6gfathe upward direction as shown in the figure. (Electron flow is downward.) At the instant a proton of charge +e is a distance R from the wire and heap68al jgg cdfy/x93f7ding directly toward it, the force on the proton is:

  95.16: A charged particle with conz)i( w(;g wvc:1a e6k:btjgyd r9rb3istant speed enters a uniform magnetic field whose direction is perpendicular to ) ygg9: :3wwrd6ce1zbtkjiarb (i(v; the particle’s velocity. The particle will:

  98.10: A charged parthe+n8q;k /xhl icle with constant velocity enters a uniform magnetic field whoshklh 8n/;qex+e direction is parallel to the particle’s velocity. The particle will

  03.34: A positively charged wggua50)fge ;;z n pu:particle of mass M is at 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 directed out of the plane of the table. What is true abogz)pgf;g 0:;u5awn e uut 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 velo:73a-p mz7iz aaiikr4city in a region of space that has a uniform magnetic field directed into the plane of t7r :a7iz zm 3aapki-i4he 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 electri htu0q, t:vs9nc charge 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 magnetics9:n uh,ttq0 v field?

  10.26: An electron moving in the plane of tdrgc dn 3)fy4l yz)h3.he 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, whicg 3d.ynfd )4hc)rz3 lyh best describes the direction of the resulting magnetic force on the electron?

  11.29: An electron moves with speed -v1+dyhapkkgnr: op7 yor:q75;sji5$1.00× 10^3\: m/s$ 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 at a speed v 3n(i:,3 zla1d 0vrxadcj2erw 33hlo ain 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 by3zid xhn 3r33ado 1,weal0:c(alr 2jv the magnetic force on the electron in this time?

  97.28: An ion with charge q, mass m, and sks;8. 5btmc izpeed v enters a magnetic field B and is deflezkcbits5 8; .mcted 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 radius of the second ion’s path?

  16.44: A proton moves in a circular orbit in a unifzq s*10n iq4ag)(ckqz+ v5wqkorm magnetic field B. A helium nucleus moves in a circular orbit in the same magnetic fieas +4gw5q k1czkvin *)qz0(qq ld. 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 t.t,v4avz +lyko the same uniform magnetic field. The ions carry the same charge and have the same path radius in talk4+y,v .ztv he 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 enters a regi14g)o ct; xzqfon of space in which there is an electric field directed up the plane of the paper (see figure). In which direction does a magnetic field have to point in thiscgq ; xot)z41f region so that the particle maintains a constant velocity?

  96.40: A proton of mass M ang yvfs5w 1w4/q0fz *ood kinetic 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 gx y ls 0zyoqm7 15 rcxxa4:n3)bh)n.acommonly determined bzsn : 5gyxan40mxyc .ho rq37a)1)l xby

  09.27: A proton moves straight up the plane of this pa4 nbx/6bmp6we ge into a region that has abp6bw4mn6 x/e 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 gravity.

  08.36: An electron moves in the plane of -i z 3uqji1ygn9x51 jyypp16a the page through two regions of space along the dotted-line trajectory sz yx1 qa-6gu1i1 9jnpy j3piy5hown 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 throutlq4+,smu gq;3u9d; nm ooyu6gh a region of space containing oq;st , no 94ygu ql;+muud6m3both 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 diretp/c+f3 ,;gm3f0iemdm8 zg rpctly between two long straight wires. The conventional current in each wire has the same magnitude, but the currents ared/g ,30mp +rf;fc p8giz3mt me 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.