09.18: A wire has a conventional current I directed to the right. At the instanaay6jss, )5:g nc55whvcav wa6,jb 9 nt shown in the figure, an electron has a velocityajn wah5,6c 5wjaa6v gsc,9n:)v by5s 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 cxd ysv* lje fmz6.1i60hoice best describes the direction of the magxdye* l6 miz6.jfv01snetic 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 conventional evp n).scn 53*gtq9l bu4w2aas50 arhcurrent I shown. At the instant shown, what is the direction of the magnetic force on the electron that is moving directly to the right toward t ute* aa0pw 9sq5h2lg)s. b35na rn4vche wire?

  13.30: Electrons flow to the left in a wire as shown. For th76wuwusihc 6y/cqi ), n o(:phe proton moving toward the top of the page at the instant shows)op 7 u,c 66 wcuiqnh/yhw:i(n, what is the direction of the magnetic force on the proton?

  94.30: The conventional current z2(tacnl .gep 3ylr1 /I in a long straight wire flows in the upward direction as shown 2p (/. nrg1t3aylzcel 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 proton is:

  95.16: A charged particle with constant tcy z+vyjy 5oozlkx,6;tz(*.k /;d*qf/htq z speed enters a uniform magnetic field whose direction is pezfl +to*yyqzjy tdc.z/hk( t;/zxovk q ,*56;rpendicular to the particle’s velocity. The particle will:

  98.10: A charged particle with constant velocity enters a unifor6o0-0) h fz9umlgv/ g5ttyf itm magnetic field whos ifh 0gt/9 l6f)0g zyutvmo5-te direction is parallel to the particle’s velocity. The particle will

  03.34: A positively charged part f(ytp hul7wqg:/n:mlk7 2 ku0icle 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 about the magnitude of thekf(2 k hmw0 pg :l/7qnu:7lytu 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 o0ko+u 6xh cil)f space that has a uniform magnetic field directed into the plane of the)oci+ hku0 lx6 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 electms9 ew.3 e2l ;dkks3vsl6)bpsx,:okm ric 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 charg3e9)m;b: l2xpkske6vwlm o,.s 3 kdsse caused by the magnetic field?

  10.26: An electron moving in the plane of the page at an angle of 300 to thezjg4 * bw3oe,+n7dvtz 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 describ4vob+nd 3,w* ezzg 7jtes the direction of the resulting magnetic force on the electron?

  11.29: An electron moves with spef. :kl o1rtfbs8dd9g 6ed $1.00× 10^3\: m/s$ 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 in5 -r 6z3fm6nph 2yevzy+)yhxb 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 d y6hypzyr-)hvxb f 6m+ nz52e3one by the magnetic force on the electron in this time?

  97.28: An ion with charge q, mass m, and speed va, 4,ck/npwt w/x5n8crcg k p, enters a magnetic field B and is deflected into a pc,8 wkctcn ,, 4r/aw/kx g5pnpath 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 magnawcby c9n o(u vch7 4q:+l+p3qetic field B. A helium nucleus moves in a circular orbit in the same magnetic field. If each particle experiences the same mu :hwcvapyo 79+nq 3(c+lbc4qagnitude 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 magnetic fi3lcn x4s,b )qyeld. The ions carry the same charge and hacnlbsxy),34 qve the same path radius in the magnetic field. Which of the following quantities must be the same for the two ions?

  02.15: A positively charged particle moves to the right5jg 3ynnje9c7r.yz)z . It enters a region 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 this region so that the particle maintye . yj5jzg79)nz3rncains a constant velocity?

  96.40: A proton of mlk m u:hep6gr0zya;+2o/e r;5ew 1fi tass M 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 is commonly tubm3h/v lq1+ determined b1m/3vt lh+uqb y

  09.27: A proton moves straight up therz t)b9tq67+c el5jlt plane of this page into a region that has a magnetic field directed ttj6ecq z9)r5lltb7+t o 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 the page through two regions wf ot-r3th 8h*of space along the dotth ot8h *3frt-wed-line trajectory shown 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 velocitc1fc3w* sgn9 my through a region of space containingn*93ms g1ccwf 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-n2y djoy + x-:,jr.yftzero velocity directly between two long straight wires. The conventional current in each wire has the same magnitude, but the currents are in oppostyrj2: -,.jd+ xoyn yfite 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.