09.18: A wire has a conventional current I 3*y/n8snun. p8 ysvaddirected to the right. At the instant shown in the figure, an electron has a velocity directed to the lef nn/ny u*dp88v3a.ysst. The magnetic force on the electron at this instant is

  14.24: For the bar magnet shown in the figuoztdr+py 1b4,kwoe. w*6evj;re, which choice best describes the direction of the magnetic field aejwz; 4 oko.*t+vpryw6 , e1bdt the point P located directly above the center of the magnet?

  11.34: A wire lies in the plane of the page with conventional current I shown. ya zluewy0p2cxy1( g w, 9rz 3k5u2t(vAt the instant shown, what is the direction o0x2gy t 5w ve,a1y9pz( kcuy2w(3urzl f the magnetic force on the electron that is moving directly to the right toward the wire?

  13.30: Electrons flow to the left in a wir xr g3v7owd).7yr/olae as shown. For the proton moving toward the top of the page at the instant shown, what is the direction of the magnetic force on .r /voxar gy)3l7o7dwthe proton?

  94.30: The conventional current I in a long straight wire flooe9y ldg3y3l)s)sg 7y 3qhx fmz 5+q:zws in the upward direction as shown in thxyyqq3z:g+3sgeos7d )z m ylh9l f)53 e 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 constan/dlfmv rdqwd)j/z1./t speed enters a uniform magnetic field whose direction is perpendicular to the particle’s velocity.d q.j1f)rdml// w/vdz The particle will:

  98.10: A charged particle with constant velocity k erym/yg e5myiyo91)rw+n85 enters a uniform magnetic field whose direction is parallel to the particle’s velocity. The particle +kny9ryiw eer5y/ 1m)y go85mwill

  03.34: A positively charged parti :s:6z8vm6r gwxteb r .7 c:ad4lcyvm+cle 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 6xbmy+:tsce7crzg wrv : v4 .6:a8ldmfield 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 .sw4 j46s jxhtg9v+fmpwxumr,9 i1g4in 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 the page. What is the direction of the electric field isw4 9pwstm.4x hg4rgx9 mifj uv61+, jn this region of space? Ignore gravity

  04.14: A positive electric chipz(:x+c wk m8uq;k rnqr6cz-e:+f ;barge of negligible weight is released from rest between the poles of a horseshoe magnet asweqb+cm-cn:pu xf+ ;;6(8 :zr krk ziq shown. What would be the direction 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 300 to the ,cjdetw,5 -jllyz:0 qhorizontal enters a region with a constant magnetic field directed horizontally in the plane of the payjj lz, q 5etw-:,ld0cge 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 movu3bxopq8w 3xeb p: to0rdh 0.2es with 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 −e and p da) qy6k 1x0b(k9hnvmass m travels at a speed v in a plane perpek6(y1 p h9xavdkn)qb0ndicular 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 time?

  97.28: An ion with charge q, mass m, and speed v enters a magnetic4spmx qv/0h25ngd inj:: h-jw field B and is deflected into a path with a radius of curvature R. If a sewvjng5:jm s 4 2dnq: p/-xhi0hcond 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 magnetic field B. A +1js -lm + y(7unuh;atuk wah:helium nucleus moves in a circular orbit in the same magnetic field. If each particle experien(n ka uj1mwa u:t;suy+h+ l7h-ces 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 wutb,7 ,c)f mrmagnetic field. The ions carry the same charge and have the same path radius in the magnetic field. Which of the following quantities must be the same for the two ionw)rutcfb ,7 ,ms?

  02.15: A positively charged particle moves to the ad(bnj:bz 6 y.right. 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 fie(jda:zy b6.nb ld have to point in this region so that the particle maintains a constant velocity?

  96.40: A proton of mass M xg65qol e+aqk; i(b .yand 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 ben (z-ig icb2)lta particles is commonly determined b-zc() i2blgniy

  09.27: A proton moves straight up the plane of this page into a region that hasi;xygxj.q5h+ :vif1 g2rg5smx go3v)no (bv) 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 componenomsi infy( +vvg ox:);h.5x3gvg2)bq5 xgr1j t of electric field? Ignore gravity.

  08.36: An electron move3bqcnsl 2:w i6s in the plane of the page through two regions of space 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 fieldi3 cb:lw6n2q s 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 conlv.serw45ke8 stant velocity through a region of space containing both anv.rse8 4k5 elw
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-zergf 7/py n4pjd +*n9wzyo 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 field in the region or/zjd7*4 p9 y+nywgfpniginates from an unseen external source.