09.18: A wire has a conventional current I directed to the right. At the insxl u9sy+jmusoxa*x85iiqhmg(;4z 5 1 tant shown in the figure, an electron has a velocity directed to the left. The magqj9 u4zuymms h;ix l58x1+x 5 isa*o(gnetic force on the electron at this instant is

  14.24: For the bar magnet shown in the figure, which choice best desc3 q i+a56 4r7jtq1)nidy5yerep yc )furibes the direction of the magnetic f ua 1qyjt5yep cf)4de6qyi n3+ri57)rield at the point P located directly above the center of the magnet?

  11.34: A wire lies in the plane of the page with conventional curr 9q co60g rvhx-+nj0beent I shown. At the instant shown, what is the dg6n +j9o beqcx-00 hrvirection 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 fm5p. oem9o ,za wire as shown. For the proton moving toward the top of the page at the instant shown, what is the direction of the magnetic force on the ,o f m9pmz5eo.proton?

  94.30: The conventional current I in a long straight wire flows in the upward di57u r :k*zig9mi9r kzfrection as shown in the figure. (Electron flo59i7rf*kugk: zrizm 9 w 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 6rz4 oj2qgc/64ys swd enters a uniform magnetic field whose direction is p/jogcq zr2sd y 6ws464erpendicular to the particle’s velocity. The particle will:

  98.10: A charged particle with constant velocity enters a unifovrvumaab -gobq;);,-kbkk)2r2/l xprm magnetic field whose direction is parallel to the particle’s veloci;vvu ak- rl/- )2b rap)bg qokkm;b2x,ty. The particle will

  03.34: A positively charged particle of mass M is at rest on a tabu.arzt,mz+7(j 2r hw6zabcr5 le. A non- zero electric field E is directed into the plane of the table. A non-zero magnetic field B is directed out of.ru6 t27(czhz ,+ zrjwr aba5m 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-zero1klcokkt+58od:ar u+v kdv+,e oj:4e velocity in a region 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. Whaku +kk:,ajee54kt+:v1 ooodvd r cl8+ t is the direction of the electric field in this region of space? Ignore gravity

  04.14: A positive electric charge of negligible weight is released fr 2nuu o62ccx5xom rest between the poles of a horseshoe magnet uxo x5cc26nu2as shown. What would be the direction of the acceleration of the charge caused by the magnetic field?

  10.26: An electron movin o2k:uhsu.x w;oqwx8+g in the plane of the page at an angle of 300 to the horizontal enters a region with a constant magnetic field directed horizontally in the plane of the pag:wo.x2ukqu +s h;x8woe 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 movel7 7hdm zagxq00 *l-o7y)bqyr8i8 qxcs with 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 tr+,tvu-h6z)etr f xg )xavels at a speed 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 tr vz 6e)xtt, fxuh)-+gravels 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 speekesdd6212 cfr :m8suxd v enters a magnetic field B and is deflected into a path with a radius of curvature R. Ifs urm6d8fkc2x2e:s d1 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 circu6m kaqkmo 66 qm40inbwt). jc1lar orbit in a 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 motin m 6qkwm10q6b)a6icko t m4.jon, what is the ratio of the speed of the helium to the speed of the proton?

  10.43: Two ions travel perpel7w4 r(eunp. )h0yb*4eauq znndicular 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 qu0*r lh(b.qnenu 4we)4u yp7zaantities must be the same for the two ions?

  02.15: A positively charged particle mt(yua nx/x eev)43d: voves to the 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 rxu(x )en ad:vt4ev/y3egion so that the particle maintains a constant velocity?

  96.40: A proton of mass M and kinetic enh0:e+/oj n ;nxz7rqvva2b* fj ergy $E_k$ 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 charged2 wc)w)0rjs f.sf xe0j0o 4vyx beta particles is commonly determined byc00sfo wsfwx. x0ry)) 4 jev2j

  09.27: A proton moves o /:s3yetuo t4ar/mr7 straight up the plane of this page into a region that has a magnetic field directed to the right. If the particle is undeflec4os/ m rue 7y3/:oarttted 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 thee. 49rcwmsuj w7.tyw j plb*(; plane of the page 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 pagswum4j 7c*. ry9l(wb .pj et;we (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 throurzmb3 8t()4m)ye amv wgh a region of space z)m)b3tmwm v4 y (ae8rcontaining 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 va07xt- ih +wctwo long straight wires. The conventional 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 fi th-w+c x0a7iveld 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.