09.18: A wire has a conventional current I directed to the right. Atapk5n1 uo)btwo p7q 4. the instant shown in the figure, an electron has a velocity directed to the left. T5b.tn u47w po)pk1ao qhe magnetic force on the electron at this instant is

  14.24: For the bar magne6+h3fknj)o fb7esfq 9t shown in the figure, which choice best describes the direction of the magnetic field at the point P located directlynosf+qj7fke96 )h b3f above the center of the magnet?

  11.34: A wire lies in the plane of the page with conventionati ,ojidk22 v0ph;+kel gt(x3l current I shown. At th vplht+ ;32ikt(jx2e0oidkg , e instant shown, what 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 i9qp7a 6p-w3 faoanf*o7r pn, kn a wire as shown. For the proton moving toward the top of the page at the instant shown, what is the direction of the magneti onpkaaro7p-n*w fa 39 ,q6pf7c force on the proton?

  94.30: The conventional current I in a 4a;giccpm : x :mubm; pv0r3.ilong straight wire flows in the upward direction as shown in the figure. (Electron flow is downward.) At themvbmc a;m.ig:xipur;p 4c :03 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;s bq n 2nzu*sz9w(5tz whose direction is perpendicular to the partqun(t2wz bs *zs;z95 nicle’s velocity. The particle will:

  98.10: A charged particle with constant velocity enters a uniform magnetic fiif76o 541 po7fih wj6sct4ehim)*y z qeld whose direction is parallel to the particle’ zpi4f7ojs57ot1hqc)y4 fw*ii 6 6e hms velocity. The particle will

  03.34: A positively charged particle of mass M is at rest on a tablelm7 ++hi)ty 84pzrgxi . A non- zero electric field E is directed into the plane of the table. A non-zero magnetic field B is dire p+ir7) g4lmytzi8xh+cted 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 constantctcxr) 5;onm 3 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 direcr)xcn3t; m5 oction of the electric field in this region of space? Ignore gravity

  04.14: A positive electric charge of negl z..mxj((xknje cy5sf wn(2u-igible weight is released from rest between the poles of a horseshoe magnet as shown. What wzj.x2-u(mnk.xcw5(je sn(yf ould 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 300o;0v7a8tsb gi()fswc to the horizontal enters a region with a constant magnetic field directed horizontally in the plane of the page as s is)t7;vg8woc a(bfs 0hown. 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 with speeb+ 0h /bf;bzjcuk5wqghr (m4hzo9 e(4d $1.00× 10^3\: m/s$ 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 mass4g2 b. x.nwwho m travels at a speed v in a plane perpendicular to a magnetic field of magnitude B. The electron folbg.. 4ww2onxhlows 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 vdd6vwpqc7ab x: bx 5aje-g -+t/a ;:lu enters a magnetic field B and is deflected into a path with a radius of curvature R. If a second ion has5+lcgaua7 /e b6d a:-vdqxbp:x-twj ; 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 orbit in a uniform magnetudjok7zmq+xk ds , 78*ic field B. A helium nucleus moves in a circular orbit in the same magnetic field. If each particle experiences the same magnitu dduxmz, j8 7*o7k+qskde 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 perpendi; p7n4 l0pqsxjcular to the same uniform magnetic field. The ions carry the same chplj0; 7qnp s4xarge 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 right. It enters a region of9iif daki n.vn2 -wd53 space in which there is an electric field directed up the plane idiv2 5 nak-dn93w if.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 masssgc3z, x*f1rhv2vu) u 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 cha qx5x o v,cjxu5xj./n2rged beta particles is commonly determined byj jqu x5nxxv5co,x./ 2

  09.27: A proton moves straight up the plane of this page into l)j1 3tjwv it((olwm(.fp k ),zylc n2a region that has a magnetic field directed to the right. If the particle is undeflected as it passes through this region, in what direction wlt(( (l2 p1 t,wy.mlf3kvci)zj njo)must there be a component of electric field? Ignore gravity.

  08.36: An electron moves in the plane of9oye a q0p6d x-dx8pa( the page through two regions of 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 sda -(do pxx 69y0e8apqhown). 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 velf5v5ut 8m su 9c0,d1 h7injnqqocity through a region of space cont1h8mfq5 njt qn uui05,vsdc9 7aining 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 velocity directly between two l (a81 wv fnytu9 usla3ds15/ixong 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 m a / yn s9l1wuftav(5ux381idsagnetic 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.