09.18: A wire has a conventional current I direydz(d( d yar 6w8af-w4dz0 x4hcted to the right. At the instant shown in the figure, an elec 4 d08z-(a4rhdxf awyzd (wd6ytron has a velocity directed to the left. The magnetic force on the electron at this instant is

  14.24: For the bar magr;io 4s bpajwv:-rq -4net shown in the figure, which choice best describes the direction of the magnetic field at the point P located directly above the center of the magn irvsoq-p-j: w r4b4;aet?

  11.34: A wire lies in the plane of the page with conventi*95 vjqgpxe 8oonal current I shown. At the instant shown, w*89 xjeov pq5ghat 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. For the px0r7fnfp nt1 5mlj lmd4x328 broton moving toward the top of the page at the instant shn20frnbp5t m7flxx l843m1jd own, what is the direction of the magnetic force on the proton?

  94.30: The conventio npa+/*mv*tba lctg.5nal current I in a long straight wire flows in the upward direction as shown in the figure. (Electron flow is downward.) At the instant a proton of charge +e is t.+cp*5 /alnvbmat *g a distance R from the wire and heading directly toward it, the force on the proton is:

  95.16: A charged particle with consta qkgzjc.n lalh 1vyg86f5hd6z47t 2fv iq47) znt speed enters a uniform magnetic field whose direction is perpendicular to the particle’s velocityylzzv78)46n c 2 vfj7k1i5h d4g ta6q.glfhqz. The particle will:

  98.10: A charged particle with constant velocity 5) 89flskezjtwe 1oo(enters a uniform magnetic field whose direction is parallel to the particle’s velocity. The particl sf5kwj)olez1teo(9 8 e will

  03.34: A positively charge:brga f/vz8w 0d 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 table. What is true about the magnitude of the electric force onvra/: fzb 8w0g the particle $F_E$ compared to the magneti force on the particle $F_B$?

  16.24: A proton moves with constant non-zero velocity in a region of space that po2o.k vbdo gw4;jjpq+v:nz a 5g 6xjq62-qr. 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 direction of the electric field in this region of space? Ignor d25.;rgk aqb q 4vovnp.o:oj j6xp -+zj2gwq6e gravity

  04.14: A positive electric charge of negligible weight is released from rest gdcj)z+z n+le rneu;r m+4,z--ef*yubetween the poles of a horseshoe magnet as shown. What woul4,*fumerz-)z z;+re+dgcnl-j uey n+ d 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 av7haykmh8 6uq2t xu 7:n 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 mhtxvu2h amu:k6 7q8y7agnetic force on the electron?

  11.29: An electron moves with sc blvp5vfc3 -bo0 o)v:peed $1.00× 10^3\: m/s$ 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 speed v in a plane8 n,bq0zg1i ul-8um1:ftz wy a 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 magneti-1ug1afq twy m u8:,lib8 0zznc force on the electron in this time?

  97.28: An ion with charge q, mass ogzh3 ud;t4o/n,*cbsm, and speed 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, cn go3 ; /*udz4hot,bswhat 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 heluseb2yr z1 zd m(i785d ,uvzn3ium nucleus moves in a circulard7 53u1eydzmzuriz v ns(8,b2 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 the speed of the proton?

  10.43: Two ions travel perpendicular to the same uniform magnetic field. T uomj-a(3/dar/lv df6he ions carry the same charg(av//l a d o6fur3d-jme 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 rb3 6m r-zh/rrr*5ldzu / 9mqviight. 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 thdrzib z5 -u /r9l36h*rqrvm /mis region so that the particle maintains a constant velocity?

  96.40: A proton of mwqss : ex-; kxz),xur1ass 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 charged beta particles is commonly mfood 6rrpy cf ,0tp.9/s1:xvio)4 bidetermined bytxrypod f1v9 /, )0.scmp:4 ribio fo6

  09.27: A proton moves straix)d0mt (b.8c+nvey 4eru eb9oght 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 directiobcno 0 b(ermu)vxt.yd8e49e+ n must there be a component of electric field? Ignore gravity.

  08.36: An electron moves in the plan1hvah) c7sd3g 3h3gq nn srk6:e of the page through two regions of space along the dotted-line trajectory shown in the3n cs6ha vq7kn)3g sgr1: d3hh 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 direction of the magnetic field in regions I and II?
Ignore gravitational forces.

  12.36: A positive charge moves with constant velocity through a region of spa)m. wy4+j;wbamsb7d cce c ; yc ).mwjmwas+dbb47ontaining 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 directly2nq6(29vjap)w zvvonz 6ugl / between two long straight wires. The conventional current in )6zu ov9va2nz/ np6vjql2wg(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.