09.18: A wire has a conventional current I directed /hpvd5wm(7 gf to the right. At the instant shown in the figure, an electron has a velocity directed to the left. The magnetic fof( v/pm5g7hw drce on the electron at this instant is

  14.24: For the bar magnet shown in the figure, which choic, xoa+svh 3hlv ff,9;ie best describes the directifas9, vvh3+ixofl,h; on 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 conventl2g 7f+/kaqbrub7 jc) ional current I shown. At thbgbj+q77rk u2f )alc /e 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 pzcp+17u 9 ifjanb7h3xbx9g 8to the left in a wire as shown. For the proton moving toward the topa9 bz nb3jgpx7up79i8+fhc x 1 of the page at the 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 th qkj;1e3ea ;q((xuiwe e upward direction as shown in the figu q3ekx(e eju;a ;w1(iqre. (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 magnik z/g9-xrdt*etic field whose direction is perpendicular tok9 gz*r/dx ti- the particle’s velocity. The particle will:

  98.10: A charged particle w;w fs78gmcd9pith constant velocity enters a uniform magnetic field whose direction is parallel to the particle’s vs ;7df8pmwg9celocity. The particle will

  03.34: A positively charged particle of mass M is at restfun ;; ej; qpbde)8tg+ on a table. A non- zero electric field E is directeu)bdeqg;tnp+; ; 8jef d 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 velocityqpg1g4f*lg hs(ys7g -y;ch-( 5 : cmfe ztx)kq in a region of space that has a uniform magnetic field directed into the plane of the page. The proton moves directly up the plane of :h gx 4-gsfqhl *-ge7m)ts1 yf ( 5ygpqzc(k;cthe 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 is rele)w3 -jh qam7zhased from rest between the poles of a horseshoe magnet as shown. What would be the direction of the acceleration oz- whjh73)qm af 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 horwu8gwqt8 hq z2ss(-s)izontal enters a r8 2hgsqw8q )swzus-(t egion 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 magnetic force on the electron?

  11.29: An electron moves with spee+esvu)9+e0iqqr6 hx2 gu bv;nd $1.00× 10^3\: m/s$ 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 trav873uq ha ai-ncels 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 done by the magnetic force on the electron in this time7uhnaa 3i- 8cq?

  97.28: An ion with charge q, mass m, and speed v enterc di06a kn3tl1s 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 are unchangedit6cn1 3k0dla, what will be the radius of the second ion’s path?

  16.44: A proton moves in a h0p3 :ihgqeg; circular orbit in a uniform magnetic field B. A helium nucleus moves in a circular orbit in the same magnetic field. If each particle experiences the same magnitude magneq3gh i0phg :e;tic 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 perpec l41oecuq3 1t1ahw( endicular 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 m1 4(a1leh1 cw3tquecoust be the same for the two ions?

  02.15: A positively charged particle moves to the right. It enters a region oz -m3iuh ujj+7rw/nr +f space in which there is an electric field directed up the plane of the paper (see figure). In which direction does a wrjr/ zimjn+hu+-7 u3magnetic field have to point in this region so that the particle maintains a constant velocity?

  96.40: A proton of mass M and kinetic energy 6e m1x2zgqb li;h,w c2$E_k$ 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 determinekzt98s )0, gw, uqc7k sil40oyh.zmgjd byos8yz .q, g cswk9m 0 uhljktgzi)0,74

  09.27: A proton moves straight up the plane of this p9bl* njn36vx tage 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 xjbn36v ln9t *a component of electric field? Ignore gravity.

  08.36: An electron moves in the plane of the page through two regs5grct xctrsx(8e 5kn:p( we +/p-mt 9ions of space along the dotted-line trajectory shown in the figure. There is a uniform electric field ek9(8gpt pmnrerx:5 (x5s w /-ct+ctsin 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 w 1acsnjv0wmi *+6w8nthrough a region of space containing both ajsanw +nv6wc0w81mi * n
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 dswif;hfm -6 q)a5 bak;irectly 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 field in the region origkm-h5 6baa;ff) iqs;winates from an unseen external source.