09.18: A wire has a conventional current I directed to the right. At :zhqb5 za q93vi)( uiieme e.7the instant shown in the figure, an electron has a velocity directed to the leftzievz.59b)i 3(qiu q :7eamh e. The magnetic force on the electron at this instant is

  14.24: For the bar magrw)b3cn -u/n dnet shown in the figure, which choice best describes the direction of the magnetic field at the point P locatwn-)n/rcbd 3ued directly above the center of the magnet?

  11.34: A wire lies in the plane o/ hp6 .,r.qr m/evxoqcf 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 wire?qhro/xm.r,c evp 6q/.

  13.30: Electrons flow to the left in a wire as shown. For:sa0*s,opnmty8rb(-n k 9 igm the proton moving toward the top of the page at the instant shown, what is the directmrnsa:som(g 0iybp,-9nk8 *tion of the magnetic force on the proton?

  94.30: The conventional current I in a long straight wire flows in the upward v cv0 s;gu0 -gqyqx;*rdirection as shown in the figure. (Electron flow is downward.) At the instant a proton of charge +e is a distance R from the wire au;*gvq gv0y0rq- xc s;nd heading directly toward it, the force on the proton is:

  95.16: A charged particle with constant speed enters a ou bztlnyg*z6jh9(e mp ;6h-0uniform magnetic field whose direction is perpendicular to thet u6jhmhz-9yn6 zbgelpo0; *( particle’s velocity. The particle will:

  98.10: A charged particle with constant velocity enters a uniform magnetic fkgb8;0wg xfio eu6skl4 /+ql; ield wh0lkoxkwu s+fq4 g/l8b6;g;ieose direction is parallel to the particle’s velocity. The particle will

  03.34: A positively charged particle p 5tc+z 26dm10 ol /s ryy99 ydpkq-geb8yhz1gof mass M is at rest on a table. A non- zero electric field E is directed into the pg9t/ -yqpzdkhog lzyys916 2rp 5+emcb1d8 0ylane of the table. 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 constant non-zero velocit56 iuin andfp+a bi52pn+p9)ey 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 )2enpbin aun96ai d 5ppf+ 5i+electric field in this region of space? Ignore gravity

  04.14: A positive electric charge oslxtw1 40o7 /fzgph9 qf 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 9g 0l ptqzf sh417oxw/by the magnetic field?

  10.26: An electron moving in the plane of the page at an angle of 300 to the4ds)d 81tekvj7eopu 9 horizontal enters a region with a constant magnetic field directed horizontally in the plane of the page as sd dve tukej)1s8o97p4hown. 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 movec mpye9/ c0:lgs 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 mass m0:fpbo 8 4 j k8fle*8qqvpil2q travels at a speed v in a plane perpendicular to a magnetic fiqp f: *bp8l4ko2jq8l f8ieq0veld 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 maw6:t6 fignc3(xbxoz l.)d9 qy jt .mg7gnetic field B and is deflected into a z.w o66bixf9:m)qx7.(dgt jncyt l3g path with a radius of curvature 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 orb,-mfr5 bdy: vbit in a uniform magnetic field B. A helium nucleus moves in a circular o :-r,bfdbv5 ymrbit 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?

  10.43: Two ions travel perpendicular to the same uniform magnetic field. The o sfmrf, 1k*sg7w(w qzdzqc;:3:y ew+ ions carry the same charge and have the same path radius in the magnetic field. Whichf+ess1rfg;qw kzyqd(: wco7*,zm3:w of the following quantities must be the same for the two ions?

  02.15: A positively charged particle moves to the right. It enters a regioh6oug.xiqde5cipnkx f7u u57 dd 3/(3 n of space in which there is an el5 cni /5 ieodkf.3x 6 u(7dgdpqu3xhu7ectric 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 maintains a constant velocity?

  96.40: A proton of mass M and kinjb7-n ey1 )e1r*y3uwn.cvonbetic 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 l)wie y*w) .h;gwfq g2particles is commonly determined byf)ew2g).yligw; w hq*

  09.27: A proton moves straight up the plane of this pb4f7z7f , daqxlaa4ywq -p r1. en3cx1age 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 direc7.1-3fa wx n4rx aby1dzp,q7cqe fal4tion 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 sp bwzj4afw o;g9.pra4: ace 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 I and II? 9j w.rp z:aofa4w;g4b
Ignore gravitational forces.

  12.36: A positive charge moves with constant velocity through a region of spv.od.xv4 sm8:wl m; qkace convo: l ; kqmm.8w.d4sxvtaining 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 constann t;z+-6j1. ra jmoppft 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 directionszp+ r-n;jj6aom1 pf.t 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.