09.18: A wire has a conventional current I directed to the right. At the instant9rx87 :u4f oo drytbi, shown in the figure, an electron has a velocity directed to the left. The rxi9t7 :4d,rybfo8 oumagnetic force on the electron at this instant is

  14.24: For the bar magnet shown in the figure, whiyetq/ o5t+cq,ch choice best describes the direction of the magnetic fieldt5qy /eqo tc+, at the point P located directly above the center of the magnet?

  11.34: A wire lies iz t7r(;e t gykhefyg/0d:i 6q;n the plane of the page with conventional current I shown. At the instant shown, what is the direction of the magnetic force on the electron that is mov ;ktf:zey 7 i6r0hye;gqt(/gding directly to the right toward the wire?

  13.30: Electrons flow to the left in a wire as shown. For the proton mgt+8 4fh2 1px+dzwz x( xw1irtoving toward the top of the pz81h ttz1wx(iw+xxf g prd+2 4age 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 inifba-m,ia1kid*7 - h c*+a6 eewq0obj 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 force on the protcah1*q-0biob 6eie+ adfm-kw7, ij*a on is:

  95.16: A charged par)9ycf8l bkgky;5k. vqticle with constant speed enters a uniform magnetic field whose directikyy)k fgk.lc 8vbq;59 on is perpendicular to the particle’s velocity. The particle will:

  98.10: A charged particle with constant velocity enters a unifjcy // ,jdsji/orm magnetic field whose direction is parallel to the particle’s velocity. The party,si/ jc/jj /dicle will

  03.34: A positively charged particle of 5rka43eciu 1x 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 magnetic3x5r cai4k eu1 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 npa 3b btk5g1m6on-zero velocity 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 the page. What ig63bm 5a1b kpts the direction of the electric field in this region of space? Ignore gravity

  04.14: A positive electric chargz1 y*pm9 /purde 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 charge caused by the magpy*pm/9u r 1zdnetic field?

  10.26: An electron m*u 919e*cak wa)5otjkmx c ir4oving in the plane of the page at an angle of 300 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 ele5ct*4ockmw 9u) r 9ai*kxja1e ctron?

  11.29: An electron moves 88gv rg.2dgvk 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 matfujz +xh /:u*ss m travels at a speed v in a plane perpendicular to a magnetic field of magnitude B. The x:fh+zujut /* 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 entb(- 3dbtlt4km,xaefk va1 5:o ea1(nters 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, 5a dt lk t,n k(:ame vbft1exa4(b3-1oand B are unchanged, what will be the radius of the second ion’s path?

  16.44: A proton moves in a ci1 6)2qqlzlb oj 13 +nm8scsyrmrcular 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 magnetic force during its motion, what is the ratio of the speed of the helium to the speed of the proton?2q6slmm z1ol3+j )nrs1y8 cqb

  10.43: Two ions travel perpendicular to the same uniform magnetic field. The hzef2+ze8mp 2ions carry the same charge and haze pz+2emh28f ve 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 righ 7nlyeqro d t5mxy - ek;s1,f:xh:f(8xt. 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 thx,yl 5oh;7sfe(y:-xmt 8k1:rfnqd xe is region so that the particle maintains a constant velocity?

  96.40: A proton of mass M , gzwa;gev6ty.3(m xy 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 electricallh vjjw.bhb)4igsd)*u61)q h 3le4tq 3q cca9ly charged beta particles is commonly determined bt 4 c46hbcqh vs) ale *jw3) lqi.g3q1u9)bjhdy

  09.27: A proton moves straight up the plane of this page into a region tm t 7me,b0g;cghat has a magnetic field directed to the right. If the particle is undeflected as it passes through this region, in what direction musg7g,e b0cm t;mt there be a component of electric field? Ignore gravity.

  08.36: An electron moves in the plane of the page through two re9l , o mtatbbysjg/ 53ol1j4d(gions of space along the dotted-line trajectory shown in the figure. There is a (ts4tg9yjaoj5 ,bo1b/3ldlm 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 constay/(i. e/v5l tflrcrc1ma)v k:nt velocity through a region of space cont:c5rtmyevlf . v(1k/l)r/ci a aining 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 p*8lpiq 0 j0d ,xpnj vik7/j-9zs(wvkconstant 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 figurdqk, 9kzpvj*v8pj0/px-j0sn iw i7l( e. 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.