09.18: A wire has a conventional current I directed to;tahqys9 f*oy 6 0qub) the right. At the instant shown in the figure, an electron has a velocity directed to the left. The magnetic t9 y;oyb6)q* f su0aqhforce on the electron at this instant is

  14.24: For the bar magnet shown in the gj 8k6c-q ,tvlfigure, which choice best describes the direction of the magnetic field at the point P v-cjk t,68lg qlocated directly above the center of the magnet?

  11.34: A wire lies in the plane of the page wit2 f(-amv .vhaa:zjm4dh conventional current I shown. At the instant shown, what is the direction of the magnetic for4-mj z(a2ah.vdav: fm ce 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. For the proton moving to0psh4q jl-b2j warb q-2 4jl0hjspd 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 straight wire flows in the u*f: 4 /yd )xr*o-veu5 knoxmvnpward direction as shown in the figure. (Electron flow is downward.) At the instant a protodnkmneu oo: rx5*x* fy/) 4vv-n 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 particleinn0 n45it7tg with constant speed enters a uniform magnetic field whose direction is perpendicular to the particle’s veloci5 40nnting7tity. The particle will:

  98.10: A charged particle with constant vek u( -k,jgrm(dlocity enters a uniform magnetic field whose direction is parallel tom(,rkg kjd( -u the particle’s velocity. The particle will

  03.34: A positively cho58icuw*d u; barged 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 magnetic field B is directed out of the plane of the 8uwco*b; udi5table. 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 f: c 71zo *ly7qzy8afrwith constant non-zero velocity in a region of space that has a uniform magnetic field directedoz f877yz*q yrl: 1fca 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 chargfnr h8 p4ih thk.tt;l ;5h /5*llcw7jge of negligible weight is released from rest between the poles of a horseshoe magnet as shown. What would be the direction of l.t7hlj 4 hhk*cli5/rn85g;f hpttw; the acceleration of the charge caused by the magnetic field?

  10.26: An electron moving in the planem ;84r gr)*jbijoo od ;c8ov7m of the page at an angle of 300 to the horizontal enters a region with a constant magnetic field directed horizontad47g8cjo o)jvo*m; 8ri ;bromlly 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 with spe :jo no8,5mu )pfl21txl*hzcyed $1.00× 10^3\: m/s$ 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 spc b7 tdk hulo38zpzk i)*8l/5keed v in a 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 work done by the magnetic force on 8to7ku5b/i z 8)l*kz3dchklp the electron in this time?

  97.28: An ion with charge q, mass m, and spe6fr7j s1d c:vqed 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 unchanged, what will be the radius of the srdc :7qfv 6j1second ion’s path?

  16.44: A proton moves in a circular orbit in a u(jm7o+n0np1 f ql/ tis *ngl;uniform 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, 1snun ll0+op j/mf;*7(inqg twhat is the ratio of the speed of the helium to the speed of the proton?

  10.43: Two ions travel perpendicular to the sam; ;h1ky de-sice uniform magnetic field. The ions carry the same charge and have the same path radius in the magnetic field. Which of the following quantities must be the same for the s;ecid 1hky-;two ions?

  02.15: A positively charged particle moves to the rig. y6sc isguk:z -/u4glht. It enters a region of space in which there is an elc giuu.s4:k/sz6 l y-gectric 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 mass M and kinetic energyvs2 (ycwxl +,o $E_k$ 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 ktofv1q3 qow7mqk ;r r*n)f;4 beta particles is commonly determined bqtqo7kf)1r rqkmf won 3 *;v;4y

  09.27: A proton moves straigh u a6xeljzh9x*rnj4/3f56 mkit up the plane of this page into a region that has a magnetic field directed to the right. If the particle i64jxme39k xn*/ulzr6ja h 5 fis 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 th-3,w wjt9q 3uwojvo,wrough 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 (autw,w ,wjv3ow-9 3jq os 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 mz+gnkx*96 2 noj.y culoves with constant velocity through a region of space containing both aco2zn6l .nkg9u *y+jxn
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 at3.,.og rnfhas;n 0:*r prdmic constant non-zero velocity directly between two long straight wires. The convegpra0io ;d3 src,mh .fn*. n:rntional 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.