09.18: A wire has a conventional current I directed to the right. At the 0c(3bvrd0 y-e z;i quainstant shown in the figure, an electron has a velocity directed tc0rveb q;0zaiud y(-3o the left. The magnetic force on the electron at this instant is

  14.24: For the bar magnet shown in the figure, which choice best describes the 50c2ffz9+ elcsv6tio direction of the magnetic field at the p +i25vcc6otls0fz 9feoint P located directly above the center of the magnet?

  11.34: A wire lies in the plane of thmzmw v8 i7i4+k x:hx594uceste page with conventional current I shown. At the instant:tm i+uxwk5 h7sz m8xc9ei4v4 shown, what 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 s7: -ax( joys yj/,ritehown. For the proton moving toward the top of the page at the inxra yy(:j/7,jose- it stant shown, what is the direction of the magnetic force on the proton?

  94.30: The conventional current I in a a.ix b 6a+ck,hlong 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 a ik,a abh6.+cx distance R from the wire and heading directly toward it, the force on the proton is:

  95.16: A charged particle with c , *15pcorju;sf0fv rvonstant speed enters a uniform magnetic field whose direction is perpendicular to the partf,5f1r0 rvp jucs;ov *icle’s velocity. The particle will:

  98.10: A charged particle with constant velocity enters a uniform magne.csrz8c, d+ y :b.uuuytic field who:c r.8uyc+yuz ,.ubsd se direction is parallel to the particle’s velocity. The particle will

  03.34: A positively charged particle of mass M.x4 tyuy;rj8l 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 th t;x8j4rl y.yue 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 zt:6)) sewhs awith constant non-zero velocity in a region of space that has a uniform magnetic field directw)sts):ez6ha ed 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 charge of negligible weight is relej /uv1t4zx3 wwjl9 o(yc jnio;24ds+jased from rest between the poles of a horseshoe magnet as shown. What would bel j 3ji /j2jy(nxdowtv1oc 4 ;z9+4usw the direction of the acceleration of the charge caused by the magnetic field?

  10.26: An electron moving in the pl04vzb6nhsw b1h .w h:mane of the page at an angle of 300 to the horizontal enters a region with a constant magnetic field directed horinmw6hz40:sv.1hhbw bzontally 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 wit89un 8bqem c7 lzeqhzo5 t3+1yh 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 masq. x:9nr1 mjzxs m travels 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 travels halfway around the circle. What is the amount of work done by the qr 91njx.mzx :magnetic force on the electron in this time?

  97.28: An ion with charge q, mass m, and speed v enters a magne fzq-y3 urd 5j8736o -xhmp(*ye1nghza6m enetic 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 unchanged7*ey3ozm-f 86 g1q 65epn hrumyndzhxaj(e3- , what will be the radius of the second ion’s path?

  16.44: A proton moves in a circular orbit in a uniform m r ;fp5 ++drip8mxq-mragnetic field B. A helium nucleus moves in a ciqr+rxm+r i;p f-d58pmrcular 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 pqv5+req k cmzx44/k6same uniform magnetic field. The ions carry the same charge and have t/ 4kkreqx5c+ zvmpq46he 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. It enters a regiong; / -.tiggvimvpp 0s( of space in which there is an electric field d s(g i.ppggti0v-/ ;vmirected 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 massuwtj 3bd e+yw8g3cu6:ttt h7 9 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 chargedtzyn9xda ,.xqjwl/i/1):y wb beta particles is commonly determined b)zy q/i:d1nxy,wj ta b/.l wx9y

  09.27: A proton moves straig (tm4zuc8 2pqfht 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 dir2mc (uqp4tz8f ection must there be a component of electric field? Ignore gravity.

  08.36: An electron moves in the plane of the page through two regions of space ack9mp*7 *vrw vlong the dotted-line trajectory shown in the figure. There is a uniform electric field in Region I directedrpc*m7vk9*v w 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 velocif tf;i0f39dxu ty through a region of space containif 3 ftxi0ud9;fng 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 betwee.svdrp *dmc :+n two 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 field and the direction of the electric field that exist at the location of the electrov.*:pcdd sm+rn? Any electric field in the region originates from an unseen external source.