09.18: A wire has a conventioi3 h+vdq .36t z 0vhsmadl(cmmd3rf+ e5-5ixg nal current I directed to the right. At the instant shown in the f+i ilhetg3(va.s 6 55+h3 vmd0rmfq- zxc3dmd igure, an electron has a velocity directed to the left. The magnetic force on the electron at this instant is

  14.24: For the bar magnet shown in the figure, ds8uy gqj) +ovw0;8ulwhich choice best describes the direction of the magnetic f 88vl 0jgu dy+q);uoswield at 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 shyxiv45k7ww c 9t1io9uyt v)j +own. At the instant shown, what is the direction of the magnetic force on the electron thau i 549+wxkwy) vt9ivt1 jyc7ot is moving directly to the right toward the wire?

  13.30: Electrons flow to the left in a wire as s ubs6ivj,,2m vjq +ti.hown. For the proton moving toward the top of the page at the instant shown, what is the direction of the magnetic jvsqu,2it+b . v, mji6force on the proton?

  94.30: The conventional current I in a long straight wire flows in thehqy/4 y.n : vogz2j2d:5hpypm upward direction as shown in the figure. (Electron flow is downward.vm:z dq.2/ :hynyh 54oyp2gjp) 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 constant speed enters a uniform magnetic field wq( zy)s r3gb. j7oy elx3jladi/7e*s( hose direction is perpendicudgi(lo* a x33z7jy7(eqel/sbr j ys.)lar to the particle’s velocity. The particle will:

  98.10: A charged particle with constajpemo 1k1g 1u,nt velocity enters a uniform magnetic field whose direction is parallel to the particle’s velocity. The particlpgj1 1ke1u m,oe will

  03.34: A positively charged particujh/-.kcohnb /2qm 8 zle 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 jcmn.qh /b2zkho8/u --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-z pj)qqr),h 4 r+gll3owero velocity in a region of space that has a uniform magnetic fi l )r+gw3l4oq r)h,qjpeld 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 this region of space? Ignore gravity

  04.14: A positive electric charge of negligible weight is released from ref9(j- )felsem fb:t6p st between the poles of a horseshoe magnet as shown. What would be the direction of the acceleration of thej)6 -lmsff (pe:eb t9f charge caused by the magnetic field?

  10.26: An electron moving in the plane of the page at an angle of 300 to 27 uypmz14 7qxxbuiao)-p bp)the horizontal enters a region with a constant magnetic field directe7 bio yb)p)a u7x-p14mq pzx2ud 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 electron?

  11.29: An electron moves wic-iy8j )l epc9d/7cx sth 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 m travels at a speed v in z s/e7:e sfqk1a 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 fez/s:71 kseqwork done by the magnetic force on the electron in this time?

  97.28: An ion with charge q, mass m, and/plppa c7hnp ;-ro7l7 speed 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, while m, q, and B are un p7l-aoc; np/p lp7hr7changed, what will be the radius of the second ion’s path?

  16.44: A proton moves in a circular orbit in a uniform margin2o 062ngzgnetic field B. A helium nucleus moves in a ngo 20 zgnr26icircular 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?

  10.43: Two ions travel perpendicular to thtc5g o- aa1i n7jy2fcm+-hz 7fe same uniform magnetic field. The ions carry the same charge and have the same path radius ih71ccz-+5 omaffgj 7-ia2 ytn n 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 enters a region o5 gaua azmxd/z 4w1 c/wd0(m,kf space in which there is an electric field directed up the plane of the paper (see figure). In which direction does a magnetic field ha gdmw(kuz5a/0/1 4aw mac,xzd ve to point in this region so that the particle maintains a constant velocity?

  96.40: A proton of mass M and kinetic energyv.oc j .j3wf-w $E_k$ 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 parti r)h)u98imwcncles is commonly determined bwn9c))uih 8r my

  09.27: A proton moves straight ho 07txs-fe)ubh fbu9(hj 2(v. qugf: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 mus 9q(s-f0of(e2vh ) jx:bh.t7gh ufb uut there be a component of electric field? Ignore gravity.

  08.36: An electron moves in thiba ).fc:cs a;e plane of the page through two regions of space along the dotted-line t :ia fb;c.)acsrajectory 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 velocity through a region of spuatn chp 44a.61q7xs*d x.axrace containing bot*au 7a rt1p4 nsx d4qxca6.x.hh 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 velocity directly between two 06oty 95cxry flong 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 fyx 0c 95tro6yelectron? Any electric field in the region originates from an unseen external source.