09.18: A wire has a conventional curredm+( c(b c/9ktn d5iw.xtfi f3nt I directed to the right. At the instant shown in the figure, an electron has a velocity directed t./f5c km+ftidt3i nwb( 9dc(x o the left. The magnetic force on the electron at this instant is

  14.24: For the bar magnet shown in the figure, which choice best 4 aezwv5qypo5;i5 w:na9xh3cdescribes the direction of the magnetic field at the point P3eyq :;c9waoxwpn54za5hv 5i located directly above the center of the magnet?

  11.34: A wire lies iqa 1(/w(wv.ncd-hu mzxhvsu+ u71 m+z n the plane of the page with conventional current I shown. At theuv zsz.(vhxmcw md1+-a(n 7u+uqhw/1 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 wire as shown. For thro0e8be;-+hb- aa+ng(kc jyt e proton moving toward the top of the page at the instant shown, what is the direction of the magneaotec; (ney-+j+h 0r8agbkb- tic force on the proton?

  94.30: The conventional current I in a long stracc : 8wgn tu1s9kg4c4aight 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 disskcw:n48gc 4t1g acu9 tance 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 magnet-bn7+nizp .qg+k h*bric field whose direction is perpendicular to the particle’s vek.*bhn-b+iqn z g+r7plocity. The particle will:

  98.10: A charged particle with constant;8uj t myj7l64cs e3,rq 6vaf 8zwjs:craz.-q velocity enters a uniform magnetic field whose direction is paral l7zus4mecj q3 tjwz:6vq 6rsc,r8af.8;ya j- lel to the particle’s velocity. The particle will

  03.34: A positively charged particle of mass M ism7zy,tfu9+a7d 5kl( e egq 9a*h j5bsp 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 about the magnitude of the electric force on the particlae(l uj97 zsyp5,qt9 +f7aehdkmg *b 5e $F_E$ compared to the magneti force on the particle $F_B$?

  16.24: A proton moves with constant non-zero velocity in a region of *t ;+o n,5,ngvk tq8a6o vbwrwspace that has a uniform magnetic field directed into the plane of the page. The proton moves directly up the plane of the page. What is the direc8twr tw6 ,,*;5n qoavbk+vnogtion of the electric field in this region of space? Ignore gravity

  04.14: A positive electric charge of negligib ydlxj :5ec;8ale weight is released from rest between the poles of a8a5; j c:lxdey horseshoe magnet 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 jafva :qy;kc7;) r +ccto the horizontal enters a region with a constant magnetic field directed horizontally in the plane of the page as shown;c y):vjfk ;rac+a c7q. At the instant that the electron enters the magnetic field, which best describes the direction of the resulting magnetic force on the electron?

  11.29: An electron moves with6vkf )5mc av+w 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 at a speed v in a planee tgsq(rpt )2wsc..s+ perpendicular to a magnetic field of magnitude B. The electron follows a circular path of radi twtrgeq)s .s2p(.c +sus 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, cfi zpxo6.y( 8kohv u0(:voy1and 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 ar8cvx.u1 o: iv o(zyyk6hpf(0 oe unchanged, what will be the radius of the second ion’s path?

  16.44: A proton moves in a circular orbit in a uniform magnetic fieli746mbymm lrqfwc. w8/nr )1xfhyq*k6i ye42d B. A helium y.y7wq16 l k 6 iwnb*/r) ymfqichmmr2f 844exnucleus 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 perpendb+/xh-y o htyxm + q(epocs90.jp (*fcicular to the same uniform magnetic field. The ions carry the same charge and have the same path radius in the magnetic field. Whichh(typ+9.of-/*cy mep(xcsh+ 0 ojbq x of the following quantities must be the same for the two ions?

  02.15: A positively charged particle moves ht1s ,98oq kiw9muuzb :u7fx ,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). Imbwxkz su:9 q81f, o7it9,u hun 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 an 7kfor.1714p7 wdwa/ vraeevyd 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 commonly determined ovr7wqq: + 8yw5pmbtqz 5y3 *obyowq*5 q:yr8 3 w+vq57ompyb zt

  09.27: A proton moves straigh3ii7j goyzv9-t up the plane of this page into a region that has a magnetic field directed to3o-9i 7 jgvziy 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 pltl17 aaf9rvs516+ li kyfx1xa ane 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 page (as xlva179tf rl y6if+aksax151 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 constan(x-ggwsz kjc cjt po,k ,u4.e/,j7,sf t velocity through a region of space containing bs4g,z fjk, cj,c wkoe,p(7ujx/.-s gtoth 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 vema,5hg t 76lasn zh1+tlocity directly between two long straight wires. The conventional current in each wire has the same magnitude, but the curraal5hzm sg7+6t1nht, ents 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.