09.18: A wire has a converyz5n2 p/b*1 kiu hlu;ntional current I directed to the right. At the instant shown in the figure, an electron has a velocity di12rzip/5;b nhl*uyk urected to the left. The magnetic force on the electron at this instant is

  14.24: For the bar magnet shown in the figure, which av6tdy5t sm9s lq5;c ka j8egz68i12ichoice best describes the direction of the magnetic field at the point 25s;tate gy6m85q kali1zci jsd8v 96P located directly above the center of the magnet?

  11.34: A wire lies in the plane o3gf r:4qg klx-f the page with conventional current 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 the w 3-gqfrg 4kl:xire?

  13.30: Electrons flow to the left in a wire as shown. For the proton moving to:mv+-ffae -uzz j*if31 cr- y8dzmmp.ward the top of the page at the instant shown, what is the direction of the magnetic force on the proton?y.jmz zmp:- 8ce1- maiz r3+fffvu-d *

  94.30: The conventional i/0 suqh6u4 5rjxb)jpcurrent I 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 distance R from the wire and heading directly toward it, the for/4p0ji j6xubq h)urs5 ce on the proton is:

  95.16: A charged particle with constant speed enters a uniform mbhu0t c p:3w, wy o80.f2 -gfkwnsxw6gagnetic field whose direction is perpendicular to the particle’s velocity3b0u 2gk6:hcpxwts 08-w,nf.g ww fyo . The particle will:

  98.10: A charged particle with constant veloa :mv.f3 rnaw+xf8;zg city enters a uniform magnetic field whose di:mv .g zf3x w+rnf8a;arection is parallel to the particle’s velocity. The particle will

  03.34: A positively charged particle of el.. ip0g;mls nd0h1lmass 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 m 0p .0i; hllegl1dm.snagnitude 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 of space that ( d;uo a,5iorxhas a uniform magnetic field directed into the plane of the page. The proton moves directly up the plane of the page. What is the direction oxu 5oa, r;i(dof the electric field in this region of space? Ignore gravity

  04.14: A positive electric charge of negligibo*fwrf9 l+qd. le weight is released from rest between the poles of a horseshoe magnet as shown. What would be the direction of the acceleration wf+*flq. od r9of 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 h)rtiq7mc *ovefbt7. 4orizontal 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 describes the direction of the resut oi).7c v4b*rq7t emflting magnetic force on the electron?

  11.29: An electron moves with saq zqsj0u +8t9peed $1.00× 10^3\: m/s$ 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 makbkl ci k4r,-.f;ff a2ss 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 done by the magnetic force on the electron in t4;k bfrcl fkf-i,.2ak his time?

  97.28: An ion with charge q, mass m, anduhlxd:b/w a unsy4+ x7y(+.li speed v enters a magnetic field B and is deflected into a path with a radius of / +yy a+bdh. u7ulslx 4ix(n:wcurvature 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 rs; jtqmw1-7o 6svqm0 orbit in a uniform magnetic field B. A helium nucleus moves in a circular orbit in the same magne smvqt7rsj6 oqw;-01 mtic 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 thehm(coyfzi qo t;55j z;9x+q0j 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 m hi;z;o(qjqz9 c5+ xtf0jo5y must be the same for the two ions?

  02.15: A positively charged particle moves to the right. It enttvu-)cv,++sp2lsru ,fzd4 hr ers a region of space in which there is an electric field directed up the plane of the paper (see ,uvc24 fsh ,vlu+zrsrp) dt+- 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 4m93:c q o;yt9 *esupxjtjut)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 determinejyffit 7e az98p043 fho q*z/nd by f 0zn9384 *jez7qotipafhfy/

  09.27: A proton moves straight up the plane vz,vtem;ml +yqqv1;.c5t3h dof this page into a region that has a magnetic field directed to the right. If thdmy;,q15 vvhe l ;cv.zm3+t tqe 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 of spacewakq 1i -0yf6e 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 shown). There is no electric field in Region II. What is a necessary direction of the magnetic field in regions f0 eqkay6-1iw I and II?
Ignore gravitational forces.

  12.36: A positive charge moves with constant velocity through a region of k41 mbnpo5 ndlr,l)k1 2 xns,yspace contain,llbm152d on y4kp )k1xsr,nning 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-zero veloci 4mp,p nlsjh98mt: ug0ty directly between two long straight wires. The conventional current in each wire has the same magnitude, but the currents are in opposite direct gp8mj 4mhlt, n:09spuions 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.