09.18: A wire has a conventional current I directed to t4v1f0h tga (qgck v3n2he right. At the instant shown in the figure, an electron has a velocity directed to the left. The magnetic force on the elv2v ht130kcg4anqgf ( ectron at this instant is

  14.24: For the bar magnet shown ini;-kz9 , (ocairtk4zvi8* met the figure, which choice best describes the direction of the magnetic field at the point P locatedrotkzt c 4,mz(-a*8 ik iie;9v directly above the center of the magnet?

  11.34: A wire lies ibhm o sw4; +fp7hr:8 bfg ()r65mupvctn the plane of the page with conventional current I shown. At the c+sb6 5rvt 4hw omg:fmb ;)87f(uhpprinstant 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 to3iv,awj9ne(u6zp ;ldqi4c 5w the left in a wire as shown. For the proton moving toward the top of the page at cld64,v 9(z5wa;nu p qij3eiwthe 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 upward d8p/n0q 017o cou1vu*gr4- wlkxkocn airection as shown in the figure. (Electron flow is downwa/q c0-rw0n1ookx*cgu4vlap nk8u17ord.) 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 +9w 3omq ijoi(enters a uniform magnetic field whos+9oi(3jqmi owe direction is perpendicular to the particle’s velocity. The particle will:

  98.10: A charged particle with constant velocity enters a uniform magnetic field8fvp j43h2bb.2oqp)n;o gxii whose direction is parallel to the partivn p ixq4.ob) gp2jf 32ohb8;icle’s velocity. The particle will

  03.34: A positively charged particle of mass M is at rebmo *14ywh y,fst 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,4m1fw bh y*oy 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 f nxklrv52+w9region 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 w5ln 2 k+9rfvxin this region of space? Ignore gravity

  04.14: A positive electric charge of negligible weightac5 an;5q9bh+eme*nfs7 pk 1f is released from rest between the poles of a horseshoe magnet as shown. What would be the direction of the acceleration of the charge caused by the magnetic f;k +snpbcqahne9mf*17 a5ef 5ield?

  10.26: An electron moving in the pa;t729ph vfo klane 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 page as shown. At the instant that the electron enters the magnetic ff27otkp v9;a hield, which best describes the direction of the resulting magnetic force on the electron?

  11.29: An electron moves wiu b4ri*h8f+0yv ftg:c+xr 9v ith 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 an(*l7fxja/zwh,l rtu1 3v 6jamd mass 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 d/xra v3*u(lwt67,lmjfh zja 1one by the magnetic force on the electron in this time?

  97.28: An ion with charge q, w/k2b472b jzw qps/ckmass m, and speed v enters a magnetic field B and is deflected 7k2/bcbjskp2/z q w4 winto 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 second ion’s path?

  16.44: A proton moves in a circular orbit in a uniy+k) 5l kesmn:wx8zij2 v:d,*g c,wps form 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, what is the ratio of the speed of the helium to the speed o*:n,,k5xy2iv )s+j wwgdmpke :sz cl8f the proton?

  10.43: Two ions travel perpendi,u;;cibo/(q ay tl4nqcular to the same uniform magnetic field. The ions carry the same charge and have the same p4/;q, n(u oalyqb ic;tath radius in the magnetic field. Which of the following quantities must be the same for the two ions?

  02.15: A positively charged particle mov.lrla5d,wm( fes to the right. It enters a region of space in which there is an electric field directed up the plane of tfm d.l(w, r5alhe 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 kineti+ze;m.eroeh t+( b26qlpis l6c 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 charw)nq1qzo6jf .cug 67lged beta particles is commonly determined buz)1w6ocq n f g.6jq7ly

  09.27: A proton moves straight up the plane of this page into : 0)ypo zkyq (1,msjnxa 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 x0:my, pj1y)zo(qkn s be a component of electric field? Ignore gravity.

  08.36: An electron moves in the plane of the page through two regioj3-emf4ncd;s m +idi d *tdia vpy q2*,nna.8)ns of space along the dotted-line trajectory shown in the figure. There is a uniform etncid,-*njy8a4mnd2ad)sfidp * m3qe v i+;. lectric 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 spap3ma5bg fruw*ey :+ls)yw)e6 ce containing bot*6f5mee:r)gpalwy suy w b+3)h 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 : n -yaf6zgoi90zpt44aqcf; yconstant non-zero velocity directly between two long straight wires. The conventional current in each wire has the same ma0fqzzo- yfn4 6 tg;pia:4 y9cagnitude, 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.