09.18: A wire has a conventional current I directed to the right. Atnoa4t7 zk: 2hx the instant shown in the figtxk 7:ao24zhnure, an electron has a velocity directed to the left. The magnetic force on the electron at this instant is

  14.24: For the bar magnet shown in the figure, which choice bzm * 7k7qcdm) ;qos,fgfd;9b iest describes the direction of the magnetic field at the point P located directly abq;gf* f7)om dsd,zm9qic ; k7bove the center of the magnet?

  11.34: A wire lies in the plane of the page with conventional curre ohhdo.hlpf5ct.epq150 4 t z+nt I shown. At the instant shown, what is the direction of the magnetic force on the electron that is moving diqh0cf4lotth dh. +5.1pozpe5 rectly to the right toward the wire?

  13.30: Electrons flow to tdvbb::ilb:oxy g z2 :k(n7imtl c,26the left in a wire as shown. For the proton moving toward the top of the page at the instant shown, wmc :yig: kd:6 ,2bb(zitvxtl:l2 obn7hat is the direction of the magnetic force on the proton?

  94.30: The conventional current I u5lfxb *x26 :qxx4vpb+od ts( in a long straight 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 vsxqxxo txfu2p *d+:56l bb(4distance 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 unifni4htt-3/. hp - skwin f*axk5orm magnetic field whose dif 3sw54 hanx-.nt*p h-kii/tkrection is perpendicular to the particle’s velocity. The particle will:

  98.10: A charged particle a +ed0*51pabvw js gkz/dyh -7with constant velocity enters a uniform magnetic field whose direction is parallel to the particle’sh/ajaw epbd 5gk-*vsd1z+07y velocity. The particle will

  03.34: A positively charged particle of mass M is at rest on a table4j4*dwi x wo4l. A non- zero ele 4j4*d4lo xwiwctric 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 particle $F_E$ compared to the magneti force on the particle $F_B$?

  16.24: A proton moves with constant non-zero velocity in ts 83.wgi tr6 ,jxbw,wd1ibz)a region of space that has a uniform magnetic field directed into the plane of the page. The proton moves dire3j.6tgxw, dwr8t,1 iwz ib sb)ctly 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 i(c3-o6h qqo6iw f tss:s released from rest between the poles of a horseshoe magnet as shown. What would be the dioq-wt3 scif6 (:h oqs6rection of the acceleration of the charge caused by the magnetic field?

  10.26: An electron moving in the plane of the page at an angl nt haadesw)-hr 90r8*,ej-cle 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 dc80,l h -9ejt-rwnda ) e*hrasescribes the direction of the resulting magnetic force on the electron?

  11.29: An electron moves w 53h p(n,nvr4bb1cdicith 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 ryn 5j zg7z9(xcharge −e and mass 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 donz7z y5 9xnjg(re by the magnetic force on the electron in this time?

  97.28: An ion with charge q, mass m, and speed v enh:je;ul-sx 7u,lbu j )ters a magnetic field B and is deflehu,ujx :l)u- se;bl j7cted 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 uniform magne8o+6zvb gkse1 tic field B. A helium nucleus moves in a circular orbit in the same magnetic field. If each particle experienceskgs6vz1o+ e b8 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 magne q c /p ylgxjyi;23bq(+pd2 1pcg.sj5mtic field. The ions carry the same charge and have the same path radius in the magnetic field. Which of t cp x+1 jqdqpl;gsmi.yp g(3c2b5y /j2he following quantities must be the same for the two ions?

  02.15: A positively charge (5(snkq6u vc9.vlzdh d 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). In which95c6qsdz . (v(ulnvkh 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 Mokwf x-wap 2j883k: e /wkyi+a and 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 igtxs .y:i7c6rr/3 zo ds commonly determined by:z/dt67 .yg rxcs3rio

  09.27: A proton moves straight up the plane of this pal+ lbf *z)j+pgge into a region 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 component of electric field? Ignore gravi+*plfz+l)b jgty.

  08.36: An electron moves in the plane of the page through two regions ofhg4)yeuzg 9 h( space along the dotted-line trajectory shown in the figure. There is a uniform electric field in Region I deygh(4uz hg)9irected 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 throughvj95ark:s*h(zz* n zc a region of space containing both azvzz h*:rc9 *ka n5j(sn
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 no2 w-x5e2cxt yx 0dz,tbn-zero velocity directly between two long straight wires. The conventionbd ,2 tt xc02-y5zxxweal 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 field in the region originates from an unseen external source.