09.18: A wire has a conventional cu9ao+rph;bx i8 qp4)4 e(my kvhrrent I directed to the right. At the instant shown in the figure, an electro4h ev)(aqmp;p br9yxi8k 4+hon has a velocity directed to the left. The magnetic force on the electron at this instant is

  14.24: For the bar mllxy*8 3ii ik/b nw)d(agnet shown in the figure, which choice best describes the directii/8l3*dw n (ixky i)lbon of the magnetic field at the point P located directly above the center of the magnet?

  11.34: A wire lies in the plane of the page wagfjd6 wj(a*5 pxa:h(al 4eq(ith conventional current I shown. At the instant shown, whax5paea whd 6*:ag(j ja4(f q(lt is the direction of the magnetic force on the electron that is moving directly to the right toward the wire?

  13.30: Electrons flow to the left i4c ,3)jiax1aymd asrhj6 + qv(n a wire 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 the qam+(v)hasi1 ,43rjy6dxj ca proton?

  94.30: The conventional current I in a long straight wire f sd01dofd9g6 elows 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 wiredde1sf 09od6g and heading directly toward it, the force on the proton is:

  95.16: A charged particle with constant speed entersv:3f.8*xpd2ilkw b(u.oa nes a uniform magnetic field whose direction is perpendicular to the particle’s velocity. The (a.:f3s wbl*p8kox ivu2 .nde particle will:

  98.10: A charged particle with constant velocity enters a uniforx a-(inn: t;t:w;cevu m magnetic field whose direction is parallel to the particlecetv:u; n(tawxn;-i: ’s velocity. The particle will

  03.34: A positively charged particle of*c3t9tep5hqi 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 taq*ei 9t35pth cble. 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 n-ze 0;pi/u . 4cyalaiwith constant non-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 is the direction of the electric field in thc-4u.iia; yzn p/la0 eis region of space? Ignore gravity

  04.14: A positive electric charge of negligible weight is r tcvm g .wchn;n7dt/)0eleased from rest between the poles of a horseshoe magnet as 7gt.td nvm wc;)0cnh/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 )bkt4t;; ;3ohd0o.tla,; oep ggw hluto 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 forct t4op o;3;gtl.0eh;)ob;ulgk hw ,a de on the electron?

  11.29: An electron moves with speed 9p vfuvkk.;*bb orl/gwpl50)$1.00× 10^3\: m/s$ 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 a8*;p,g a rm0 m;rm 3kokwv2jxst 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 thx posk;g3rwa,2 k j; 8vmm0m*re magnetic force on the electron in this time?

  97.28: An ion with charge q, mass m, and speed)bo8ardeb3 )k+kf.l j v enters a magnetic field B and is deflected into a path with a radius of curvature R. If a second ion has speed 2v, whi) aobj fe+8)l3drkb.kle 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 helil3cm1dk f-.kz um nucleus moves in a circular orbit in the same magnetic .1 kc-m3dlzfkfield. 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 perpejy0 ff ;wxc2b;,mu )apndicular to the same uniform magnetic field. The ions carry the same;fwcm y), jf2a;xbu0 p charge and have 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 rig/ofl-.h 2 +vmmfbg9kjht. 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 mainta-jh o/fvg+2kmf. lb9mins a constant velocity?

  96.40: A proton of mass M and kinetic energie(zyt 8xfm0 0y $E_k$ 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 i i bd2n8fo6 5l)ee1w ispk1te4io3k b1xq7dn)s commonly determined by1nb6 te 1o b)2lf 3nwdieo x4p7sidki8keq )15

  09.27: A proton moves straigpxnf4 ,ym;9wl4dz;55o: o9caia ia qh ht up the plane of this page into a region that has 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 componenc 9:f4m la4ihqa z5y px,59 woin;aod;t of electric field? Ignore gravity.

  08.36: An electron moves in the plane of the page through two regions ofbxx tj0i4.. mw7h t q8 zq8b3jl/zp*hf 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 field in Region II. What is a nefj.4m j 8lbqi 8z*hw0pt3 / ztqh7bxx.cessary direction of the magnetic field in regions I and II?
Ignore gravitational forces.

  12.36: A positive charge moves with constant velocity through y.5gu+fh5 kvg haxsm 6::iok.a region of space containikv+ f5g :xk ush.oya :m56.hging 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 velc2d -jig*ulj*f--pmp6 4v cd locity 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 direccclpl* jdgm d2-vi* u6f j4-p-tion 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.