09.18: A wire has a conventional c 48hv8-tujkkw urrent I directed to the right. At the instant shown in the figure, an electron has a velocity directed to the left. The magnetic force on the -wt ku 8hkjv48electron at this instant is

  14.24: For the bar magnet shown in the figure, which choice best describerum s7a2 .-lndru5.rroe 6j8ps the direction of the magnetic field at the point P located directly above the ce76ndu8a- 2.m rj.prs l5urroenter of the magnet?

  11.34: A wire lies in the plane of the pagxn2x4t+ *gand30h nv le with conventional current I shown. At the instant shown, what is the dira+dv*n 0x2t4 lngxh3 nection 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 wire50a5 qow3ryi q as shown. For the proton moving toward the top of the page at the instant shown, what is the direction of the magnetic fo5qq5iaoy3 0wrrce on the proton?

  94.30: The conventional current I in a long straighiwr0:p qa/hw2t wire flows in the upward direction as show/a20 rwwq:pihn 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 proton is:

  95.16: A charged particle with constant speed e8 alhca by,-,xnters a uniform magnetic field whose direction is perp, hx bl-aay,8cendicular to the particle’s velocity. The particle will:

  98.10: A charged particle with constant vq.t jojl,2a k6elocity enters a uniform magnetic field whose direction is para2 aj6,ltk joq.llel to the particle’s velocity. The particle will

  03.34: A positively chargeszxq1 :1ihj 1ld particle 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-zero ma: s jq1iz11xhlgnetic 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 n c1hzmrw:;vq(o *6ih jon-zero velocity in a region of space that has a uniform magnetic field directed intm6;zv j*(w iq:1hhcoro 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 elecpua f75acb.+ i.0) nc;zaidvo tric charge of negligible weight is released from rest between the poles of a horseshoe magnet as shown. What would be the direction of the acceleration of thez ; .auc5 i0f.ncd7 avopi)b+a charge caused by the magnetic field?

  10.26: An electron moving in the plane of the page at an angle of 300 o1 g:rvbj)6 fyto the horizontal enters a region with a consgvfyo 6 rb:1j)tant 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 electron?

  11.29: An electron moves withdl65qka l8 g4a7w 43nrib)t ksr2rs7o 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 tra/be)g 5fw*mn nh wt)4wvels at a speed v in a plane perpend4h)t5e g/ *n fwwmnwb)icular 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 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 B and p5stjlv q+smvb4j( 34is deflected into a path with a radius of curvature R. If a second ion has speed 2v, while m, q, and B are unch5(4 qbsm3l vjs t+jp4vanged, 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 B. A h k,wfznd0 x5.relium nucleus moves in a circular orbit in the same magnetic field. If each particle experiences the sad0,k5x r wz.fnme 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 uniaks-)t vlv5 -dq8jac*form magnetic field. The ions carry the same ca-a l-)qv vd*5s t8ckjharge 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. oyqd wh4dz1i i+ kn/t o:+0bw/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 too4+/tw n:/1bzk 0 hidy+dqwoi point in this region so that the particle maintains a constant velocity?

  96.40: A proton of mass M and kinetic ene86bz w ks/x0sfrgy $E_k$ 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 electrie/km*5; xvl 7npz 3intcally charged beta particles is commonly determined bn zl5 i;*mxe7 nkp/t3vy

  09.27: A proton movewl2/sp- c((j b jep7w00jdgans straight 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 must there be a component of el(02bjw0nj 7jl /p d-sa (wecpgectric field? Ignore gravity.

  08.36: An electron moves in the plane of the page through two 2md,x 3p83:.wc 4csbwnhs vai.)usrg regions of space along the dotted-line trajectory shown in the figure. There is a uniform electric fwv).wbc4s8xu,r 3sd 2 n3:mahps icg.ield 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 condggr5o4q vz9 50wppp*stant velocity through a region of space containiwo 0p5 4vq5z9rpg*gdpng 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 movytmaaq.1u- 8+m 8dpqves at constant non-zero velocity directly between two long straight wires. The conventional current in each wir1 my t8.8qqam+ad- pvue 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.