09.18: A wire has a conventional current I directed to the repr(/ am z r+s3ur:5ygre(gp 2ight. At the instant shown in the figure, an electron has a velocity directed to the left. The magnetic force on the electron at this in2r(r3y(p 5 ra pru+ gzgme:/esstant is

  14.24: For the bar magnet shown in the figure, which choice ;bkb5.pxxwg, best describes the direction of the magnetic fg x.wkx 5;p,bbield at the point P located directly above the center of the magnet?

  11.34: A wire lies in the plane of the page g+ynsa1p 95h 3e2,t9k nbheuqwith conventional current I shown. At the instant shown, what is the direction of the m u3h2s e+yteqk99nb 1a5h p,gnagnetic 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. Forxd00tf nst7y:):)yinb u tut6 the proton moving towaxt f)t) :du nyyb70iu0s:tt6nrd the top of the page at the instant shown, what is the direction of the magnetic force on the proton?

  94.30: The conventional current I iqm0m at 1vxpd; sk9t2,n a long straight wire flows in the upward direction as shown in the figure. (Electron flow is downward.) At the inst 0 m9vq;p s1mt,atx2dkant 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 ul(itx j5c fg s++*mmj9niform magnetic field whose direction is +*cijfsm5g jtx+ m l9(perpendicular to the particle’s velocity. The particle will:

  98.10: A charged particle with constant velocity enters a uniform magneti: x ry/hniu.npf y70j +jy4b cq1v6ccb*es j,-c field whose direct0 uy j xfci qs:-c76hy4n*j1njcbp.yev,/b+rion is parallel to the particle’s velocity. The particle will

  03.34: A positively charged particle of ma 2a 7i(p8+y.qdjnkrnyjop u3i2, ikf*ss M is at rest on a table. A non- zero electric field E is directed into the plane of the tabl7 y2pnpi j8+jk( ,ir2fda.* uqonyi3 ke. 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 consx xw * g59uhk5jp ta:ttg)yx4-tant non-zero velocity in a region of space that has a uniform magnetic field directed into the plane of xh5 xt 9kp4twxg*ajgu)yt5:-the 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 electric pbttl8 dnk:gp /8 h8)gy :jny;charge of negligible weight is released from rest between the poles of a horseshoe magnet as shown. What would be the di;dn : hgyjpkt88t8g :ynp l/b)rection 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 300rxc 1n.;z dc9i 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 describes the direction of the resulting magnetic force on the electrind;.r 1 cxzc9on?

  11.29: An electron moves withk96ul cifz5i+)eu7 pw 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 −eu6zs-7i mifeu/6rw:sr mhot 0yg-8 x5 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 cohx76t0-658ifumi/s-w uer smzg :r y ircle. 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, and speed v enters a magnetic field Byeh8ioc (y*(3 n0rcv, qbnw8j 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 unchanged, what w*j8q cynrcn0ie8(v,y3hw o (bill be the radius of the second ion’s path?

  16.44: A proton moves in a circular orbit in a oy3z2zi )j pqyb-:9i auniform magnetic field B. A helium nucleus 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 speaqpj 9y-):bi23 yiozzed of the proton?

  10.43: Two ions travel perpendicular to p6b /a+ yhjv1ythe same uniform magnetic field. The ions carry the same charge and have the same pathj6ba1 +vpy h/y 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 right. It encutu7 1(5m lpvt* e.dgters 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 maint7(5*ltdvp1 u cg .emutains a constant velocity?

  96.40: A proton of mass M and kinf3ua;yktb ipy8q afmj w17 -30etic 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 commogjmt,((wxyh(l wn0j* nly determined byj(mh(g*ly w n0jx(,wt

  09.27: A proton moves straqe bx .pzlup:.4vg/)0 haht1hight up the plane of this page into a region that has a magnetic field directed to the right. If the particle is undeflhx4 0 tl u)1zgppvhe qh./.:abected 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 tn v0d41stgh:afe+u- whe page through two regions of space along tht14aw-d h+vng uf:se0e 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 I and II?
Ignore gravitational forces.

  12.36: A positive charge moves with constant veloc +abkdm iwndix;+*e3,4/ +hwsvqvt k*ity through a region of space containing both mhq3,n4w +v/atswd*ve+;+*x iikkbd 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 c6):pk tea5s.h:wz zyb0ogb0 u onstant non-zero velocity directly 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 fie:uwp 0 .zby ogtszbh0)a65ek:ld in the region originates from an unseen external source.