09.18: A wire has a conventional current I directed to the right. At the insteedmlptk*at3 7q u6 )6ant shown in the figure, an electron has a velocity directed to the* 6ut3q teel7p) kamd6 left. The magnetic force on the electron at this instant is

  14.24: For the bar magnet shown in the figure, which choi)k9qds2)x kptce best describes the direction of the magnetic field at the poin d x)9psk2)kqtt P located directly above the center of the magnet?

  11.34: A wire lies in tmu pzd 8u,w-f,he plane of the page with conventional current I shown. At t 8mwd z-,p,fuuhe 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 in a wire as shown. s g;rl8*dj 6ulmpzm .,t4,vew For the proton moving toward the top of the page at the instant shown, what is the direction of the magnetic force l*p 8m;,4v ue6.t,wj lzgsdmr on the proton?

  94.30: The conventional current I in a long str/ )fhfs iovj);aight 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)foh/jsfiv); and heading directly toward it, the force on the proton is:

  95.16: A charged particle with constant speed enters a unif:m9 qrmtpmw2- 4khwr)e,gz4 zorm magnetic field whose direction is perpendicular to the partiqmr,z et9:)wz k442mm-ghwprcle’s velocity. The particle will:

  98.10: A charged particle with constant velocity enters a uniform magnetic fi/ai5,ypcdi8jy;vd3k/j cryr nf8f; ( eld whose direction is parallel to the particle’s velocity. The particl /3;8 ,icckdj /dfan8rrfj;vy 5ypi(ye will

  03.34: A positively charged particle of mass M is at rest on a table. A f lj.t-8i0tk5f0rx /i9k d5sg0nnjz dnon- zero electric field E is directed into the plane of the table. A non-zero / iztx-dnnl05it5kj frdk 0fgj0.s89 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 wit30 xiayef8fr(h constant non-zero velocity in a region of space that has a uniform magnetic field directed into 3 i f8arx0yef(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 weib59us vgr9r3q ght is released from rest between the poles of a horseshoe magnet bruvgr q593s9 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 thdi /fv/k 4lwh+phyd(1e page at an angle of 300 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 magnetic field, which best describes the direction of the resulting magnetic force on the electroiy whl/41d+ ( dfhvkp/n?

  11.29: An electron moves with spemu;lw -a6+o xz1(fawy g4l *i+okkdy9ed $1.00× 10^3\: m/s$ 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 speedc;ils0sso. ()xumj/v rs /mf- v in a plane perpendicular to a magnetic field of magnitude B. The electron follows a circular path of radius Rcx-0uml m v.j ofrsss;/(/)si. 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 magnetic field +v j jh6o)vuw3xf r1k:B and is deflected into a path h: jfvwx ok)1+6j uvr3with 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 orbit in a unils deomlzch06rsf1vy20:np8 p+y(l .form magnetic field 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 thz1rceoy0 mf+d6ny.s :h8v s2pl(l 0 ple 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.fe98nzxvtfw:e ,fvz2 /r21fk The ions carry the same charge and have the same path vrf9 1zffft2e8,/ ex kn2vz: wradius 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 b79mmmz aid)vv74u:sc,n wz5 right. 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 regiobcn 9)4: z ms7mwdza,iv u5vm7n so that the particle maintains a constant velocity?

  96.40: A proton of mass gml 6a; wx6*w 9l15dho h7sxbq ba1*srM 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**okk8u2sl u e:o;o.g2xp3ht p qx2sa charged beta particles is commonly determined boep3:; 8k. k *g2solua qt*phu2xsox 2y

  09.27: A proton moves straight u qvfk :*q8cd:v kws9e7p 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 throug* e:q7 dvkfc8v: 9skwqh 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 through z sth5 (qfmzhj..i/it8uma8ag/; iw/ 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 shown). There is no electric field in Region II. What is a necessary directio (g8.iiq zt uzw/aa8;histm/ mfjh.5/n of the magnetic field in regions I and II?
Ignore gravitational forces.

  12.36: A positive charge moves with constant velocity through a j z ;-;f9snmldregion of space containing both an;j;9mzl dsfn -
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 nowu3d( dw7 (knjni,5fc3 2xl swn-zero velocity 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 3f2k nw( ndd3(5 liw7sx wc,ujthe 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.