09.18: A wire has a conventional current I directed to the rxm) 6sw/ ydxk tl uke:.2s9k3gight. At the instant shown in the figure, an electron has a velocity directed to the left. The magnetic force on the electron at this 6 mgls/wt2 ksdyx.uk9ekx3 ):instant is

  14.24: For the bar magnet shown in the figure, whic4(j)n an 6pv6f uyupeb(8-xxxh choice best describes the direction of the magnetic field at the point P lova(n-6 nx()ub 6ppjxu8 xe f4ycated directly above the center of the magnet?

  11.34: A wire lies in the plane of the page with conventional currentjr ml6 5xo*j: 2aa(ywr I shown. At the instant shown, what is the da 5*a r:ojl 6yrjx2m(wirection of 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 wire asux2 a;v b.drb4b 5jyh. shown. For the proton moving towa;du a5 jvbrbh4.yb.x2rd the top of the page at the instant shown, what is the direction of the magnetic force on the proton?

  94.30: The conventional current I in a long strai;1/i 3gb9sspwul zaz2ght wire flows 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 wire and heading directly toward it, the force on the 3pu; gzl/sw92b1zisaproton is:

  95.16: A charged particle with constant speed enters a uniform magf5dp8q/f b;q bso +x8o7;wsug netic field whose direction is perpendif;qob5p du ;8 /w7fosbs+qgx 8cular to the particle’s velocity. The particle will:

  98.10: A charged particle with conb 8ne63+r sn ash7qpz0 :njs*futx1*kr- -xme stant velocity enters a uniform magnetic field whose direction is parallel to the particle’s velo6sh3teqnzxn r7 0k+:f sam--b*u1nj s* x r8pecity. The particle will

  03.34: A positively charged particle of mass M is at rest on a table. A/pmil hm)m*olq +0a u:l2,wch6c zup8m 5 gn7z non- zero electric field E is directed into the plane of t p)z8mqoh 5uu7w mll*nm,m c pcaig+6lz0/2h :he 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 w2 6i8z;k rarw9-ospr1mmow. ma z;4g pith 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 th 4z ogwar9sp;6. 8rkpmmi; rmw1ao-z 2e 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 jmuo;awv6y+-poagcl2.3b1o released from rest between the poles -w; ug+ obcpajo.a1vo3m l6y2 of a horseshoe magnet as 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 lr:5v8yl*ojst g64 ; yhfnu4dh ,cel3300 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 m4hjh68lrcl3*,g 4 ; lf:e5 suyondytv agnetic field, which best describes the direction of the resulting magnetic force on the electron?

  11.29: An electron moves with sphz1z/mrkuaf3: 5 *kuw eed $1.00× 10^3\: m/s$ 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 −tn up3va:(lt: e and mass m travels at a speed v in a plane perpendicular to a magnetic field of magnitude B. The electron follows a circ pu:(a: ttvnl3ular 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 2 x .dnwui uvmd1(w/kz-+8lrpenters 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 unchanged wk8dv2(/r.pmz+x ild-1u uwn, 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,50z/3 4q8cb i 4w.hi kznvq hsj7khde 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 ihdkz qck 4/nhw, 5 4z03v.heisbq7j8 the speed of the proton?

  10.43: Two ions travel perpendicular to the same uniform magnetic field. The ion7, /u()c / *sn3 vdobdumrkovos carry the same charge and have the same )su no7o vdb mk/rd v,*3o/u(cpath 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 tc,l(rg *f;s( yh4pk3f i0/byj(dooo; iah pz2he right. It enters a region of space in which there is ao3y0od p ff;,;(c(2 hzlj*( 4gbr hp iisayok/n 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 maintains a constant velocity?

  96.40: A proton of mas x4l--sz hn.0 vbtrln6s M 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 electrically chan,-h bf*jfwn *7w1xfcrged beta particles is commonly determined bh-fn ww *nfxfj7b*c ,1y

  09.27: A proton moves straight up the plane of this page into a region-oj-ugc3n5 gnu5 :yh y that has a magnetic field directe3g-nyo :-5uun 5gyjch d to the right. If the particle is undeflected as it passes through this region, in what direction must there be a component of electric field? Ignore gravity.

  08.36: An electron moves in the plane of the page ylyiv2wg0urf10 1 yq,through two regions of space along the dotted-line trajectory shown in the fi0fy10yuly2qv1gi, r w gure. 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 rewnu 4 mmiqfeb )0)e2i1gion of space containing bo uwiib2 0men)m4feq 1)th 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 md656a kof:lg5 cl)f8:n fv qvgoves at constant non-zero velocity directly between two long straight wires. The conventiodo f58n)v5:6fqf gv 6lc:a kglnal 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 originates from an unseen external source.