09.18: A wire has a conventional current I5wzgiwqf 7i,mta)o **f/v , dr 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 electvizag trw*d,q,f m 75/f)*iworon at this instant is

  14.24: For the bar magnet shown in the figure, whhys7l)s2n * qaich choice best describes the direction of the magnetic field at the point P located directly above *7 nlssyaq2 )hthe center of the magnet?

  11.34: A wire lies in the plane of the page wit3vy2mqm) ,gc *tl *pploahgwt1;be;/ x l(eh;h conventional current I shown. At the instant shown, what is the direction of the mag v1ph2l*h,qe3lt o ;y(twp)l/;gx*mmg ea ;cbnetic 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 ta3n;ljpw 33 awfz84 xghe proton moving toward the top of the page at the instant shown, what is the direction of the magnetic force on the prot;fwa3jx34w p 3ga 8nzlon?

  94.30: The conventional current Ian4qr6k e-4ik -8m zju in a long straight wire flows in the upward direction as shown in the figure. (Electron f4 k86-inmj4q uekaz r-low 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*yga9*jcs-g* +p+fgq:ogq m j speed enters a uniform magnetic field whose direction is perpendicular to the particle’s velocity. Th-g* s*c m* pjo gqf+a:+jg9yqge particle will:

  98.10: A charged particle with conss b(2zy s5acc4tant velocity enters a uniform magnetic field whose direction is parays 4bccs52az (llel to the particle’s velocity. The particle will

  03.34: A positively charged particle of mass M is ab 6st,5(r vsm yed,pg3t 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 ou ,gyts sr, p5d6bvem(3t 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 non-zero velocity in a refyp yk,fg( rlz k+:3b/l mc;j/hhlj,; gion 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 direction of the electric field in this region of space?lf; fbcjkl, ,m:l/h / +gyh3rjyp(;zk Ignore gravity

  04.14: A positive electric charge of negligible weight qi gsq2 v.2ca8is released from rest between the poles of a hcv.2gqq8i 2 saorseshoe magnet 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 the page at an angkcvcd;u los y /bomefx;-xxv93*q1r)s 7c9u5le 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 res53xsysr mxc*d v q)c-/e;lcu7o19uf ; xvko9bulting magnetic force on the electron?

  11.29: An electron moves with speeddksh g5wh9u3 70 vvs+f $1.00× 10^3\: m/s$ 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 l5 5qkhow n1((zoquiu9d. a;rat a speed v in a plane perpendicular to a magnetic field of magnitude B. The electron follows a circular path of r1 (r;ndk o9(wuu.q ihalq5zo5 adius 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: m/m719yx udk(pw sar, mass m, and speed v enters a magnetic field B and is deflected into a path with a radius of curvature mrx79 mwdu a(k /ys:p1R. 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 cirkvau.c 5uf 60bcular orbit in a uniform magnetic field B. A helium nucleus moves in a circular orbit 6ab0 5kvuu c.fin 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 perpendicq4, -qu- 2o hnk trvt0hc,0aftular to the same 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 sah40a-qhr uqt- v2to 0,ktcn f,me for the two ions?

  02.15: A positively charged wponzy/te - zqq(to8m)4siqaf73 3 .z particle moves to the right. It enters a region of space in which -.ez( 4t7pa8 y q) s/zoqtzonfq33imwthere 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 region so that the particle maintains a constant velocity?

  96.40: A proton of me mn9sq1,m- ami-f4d dass 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 )5vp5wi,zxk 6yed pqzi8z .+lcharged beta particles is commonly determined b8v56pzq z lk) .ix+ep,zd 5iwyy

  09.27: A proton moves straight up the plane of this pagit )47.qo9 mtc0toq1agwp9d b8yl/ lie 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 gcwl/yp4o 8 9 .tl)a10ttb i9moiqd7 qcomponent of electric field? Ignore gravity.

  08.36: An electron moves in the plane of the pagl686i lfl r:lmh)c0m+ng(ff u e 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 shown). There is 8l l(l rmu+06fhn:l6i cmgff) 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 space xu 1v: gw(b7facontaininga f 1vxubg(w7: 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 :k b :c6/pb(/p mwk/rme, fvjntwo long straight wires. The c mp /(/vkj:bfrn6bec:mw,/kponventional 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.