09.18: A wire has a conventional current I directed to the right. At t v u-w6n-;w -yxjlwun(he instant shown in the figure, an electron has a velocity directed tu--wx uvlw ;y-jnwn (6o the left. The magnetic force on the electron at this instant is

  14.24: For the bar magnet shown in the figure, which (2;joc)hb /rvxsm; akchoice best describes the direction of the o) ;axr shv2bm(ck/j ;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 co:0gzli2t6tpcgjbxz g mc-+ .5)czz6p nventional current I shown. At the i-0cm2t6j pi)g zg6cz bzzlpt :5 x.gc+nstant 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 wire as shown. For the proton moving toebqexa7zt2a-75 ge)s ward the top of the page at th-x2ge7z7b5e )sqe taa e instant shown, what is the direction of the magnetic force on the proton?

  94.30: The conventional current I in a long straigh5vdx8+0rys3pw9t7a h ediqcyoac 432t wire flows in the 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 heading directly toward it, the force on the protooc9 dy+ i5 ths8darxayp70 3ve4qc2w3n is:

  95.16: A charged particle with constant speed enters a uniform magnetic f(ke 7 yoracft3b;d9 ok9y7;ox ield whose direction is perpendicular to the particle’s velocity. The particle wif9 kxy9; rd(73kty coeb ao7o;ll:

  98.10: A charged particle with constant velocif7 zqw40:bd.px( 3qza 8wueyhty enters a uniform magnetic field whose direction is parallel to wqe 0azh:8 y. ub3wz7fxqd(4pthe particle’s velocity. The particle will

  03.34: A positively charged particle of mass M is at rest on a table. A ck ;ekvkfw4qi3mlw tzf *6)dl1 r0:p8non- 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 about thewmd38cwk lpkefl *41ifvtr6 )k; zq0: 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 o+sc 4i01fqhgu f space that has a uniform magnetic field directed into the plane of the page. The proton m1 u4sqgf+i0 hcoves 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 n.cf/j s pugv7(x kes)5egligible weight is released from rest between the poles of a horseshoe magkpc7 v)g/s. 5js(fuxenet as 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 page at an angle of 300 to the hor(4 d 0py8*+ayoqfwdzbizontal 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 fiewd*bozy+d(f4pa0qy 8 ld, which best describes the direction of the resulting magnetic force on the electron?

  11.29: An electron moves with spjxj y1 j.i*vv w,/1sh/6 jyhhpi f-th0eed $1.00× 10^3\: m/s$ 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 tral)ncykbx5xbxf-9t 5lm6 a 8h +nfks82vels 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 a925sxh a+)mb -tlfb n8xnxk5cf6ylk8 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 B+ hxl+qdk7 k3d 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 the r7d+ lkx dqh+k3adius of the second ion’s path?

  16.44: A proton moves in a circular orbit in a uniform magnetic fiel 5e6lgne e/6iyd B. A helium nucleu 56en i/ee6gyls 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 helium to the speed of the proton?

  10.43: Two ions travel perpendicular to the same uniform magns* pf ,dzr6w9netic field. The ions carry the same charge and have the same path radius in the magnetic fpdz96n *fws,r ield. Which of the following quantities must be the same for the two ions?

  02.15: A positively charged particle moves to the right. ia h1y*r1mnc.:ek0eu It enters a region of space in which there is an electric field directed up the plane of the y:r1 i eaec 10nkm.*uhpaper (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 enerr*d+e/x3oecpr9 -5x2 ooj wfmgy $E_k$ 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 c /aj/sj8p u+fgx26yniommonly determined by sj/jya26gin /fupx8+

  09.27: A proton moves straight up the plane of tle oubp6emh3 on8 /*8khis page into a region that has a magnetic field directed to the right. If the particle is undeflected as it pao3pn6*oeh mubl 8/ek8sses 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 0iwjaued2 nd3dp-3 zf-if1z:the page through two regions of space along the dotted-line trajectory shown in the figure. There is a unifor e0uaj1:ddw3i f -n-3izdpfz2m 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 con3iz h,wr06c7i 0fle qestant velocity through a region of space conta7q,h03 0rezcwl ife6iining 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-zeyz0apg6 dn7:ostyl ;-ra :6prro 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 direc : ty-nzl6psd7g6op r:0;ar aytion of the electric field that exist at the location of the electron? Any electric field in the region originates from an unseen external source.