09.18: A wire has a conventional current I do -x0.eqsw9ds 7,7 scxjnlst, irected to the right. At the instant shown in the figure, an electron has a velocity directed to the left. The magneti.s ntw,c, sod l7-ex0s9jsqx7c force on the electron at this instant is

  14.24: For the bar magnet shown inp4 yyztorpnrv 7:d 4ls*u/ 4ryax qg--6.;fzo the figure, which choice best describes the direction of the magnetic field at the point P located directly above r 4u4zy6po*nl.v:d- -;4gzy yxr psqot/ 7fr athe center of the magnet?

  11.34: A wire lies in the plane of the page with conventional currentl10)uetxawo *k54-z( bam o08hw hwpv I shown. At the instanttho-a4wapmb)eh*1wu5 xz(8 v ow k0 0l 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 shown. Fory sx7rcxlc4e;. twr+ rh2 v19a the proton moving toward the top of the page at the instant shown, what is the dir7 t cxa .l9ryvxch+12s;r re4wection of the magnetic force on the proton?

  94.30: The conventional current I in a long straightl dx+(r7faxqcc9a+/h wire flows in the upward directi lr /qfca+ca(dx7hx 9+on as shown in the figure. (Electron flow 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 ent* ca rmp7a: p. eajhx,le)rm+:ers a uniform magnetic field whose direction is perpendicular to the particle’s velocityh*ma+xaee ra .cr7lp j:mp): ,. The particle will:

  98.10: A charged particle with c v8 .f:loppwowb(ah8u(hi2, m onstant velocity enters a uniform magnetic field a(bhwof(ol,2umppwhv:88i. whose direction is parallel to the particle’s velocity. The particle will

  03.34: A positively charged particl3k4g u0y;n rri)gx;va e of mass M is at rest on a table. A non- zero electric field E is directa;; iyux30r4kgrvng) ed 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 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 region of s96ihr;u4 t,nyb (wi thpace 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 directi huwy4t;,9i6 bh( rtnion of the electric field in this region of space? Ignore gravity

  04.14: A positive electricp0p+qks.m1j7ywb8vr charge of negligible weight is released from rest between the poles of a horseshoe magnet as shown. What would be the direp8jb +q ws .0k7p1myvrction of the acceleration of the charge caused by the magnetic field?

  10.26: An electron moving in the plani,hbkk7v 9ec::ag+tg e 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 field, which best describes the direction of the resulting magnetiv7 h: gtcb+kagk: e,9ic force on the electron?

  11.29: An electron movep3ugf05kl )wvlty0 3m s 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 wi4fg cyf.mdrz) s 5m6v(th charge −e and mass m travels at a speed v in a plane perpendiz5f6gr mcfvsy.)4d (mcular 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 magnetic force on the electron in this time?

  97.28: An ion with charge q, mass m, and speed v enters a may wf2;fdah2h:gnetic 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, d2f whhy:f a;2 what will be the radius of the second ion’s path?

  16.44: A proton moves in a circular orbit inzgbcj, .6ed2tx 2xsy0 a uniform magnetic field B. A helium nucleus moves in a circular orbit in the same magnetic field. If each particl,czy.2 2sxbd 0jt6gexe 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 ;+wyzz9s+xot 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 z z+sy;+xwo9tbe the same for the two ions?

  02.15: A positively charged particle moves to ta*hd, pz xs9p+he 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 th d9,pxph as*z+is region so that the particle maintains a constant velocity?

  96.40: A proton of mass M and kiera(we*) hi5l netic 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 pzu5f)z r; )tgrarticles is commonly determined bfzr z;) tu5)rgy

  09.27: A proton moves straight up the plane of this page in+bwmrgfcrt8ldfgr1 c 1h62 9pa8/, c jto a region that has a magnetic field directed to the right. If the particle is undeflected as it ahrbpfg91 trl+/w18 cc6g 8,m j2fdcrpasses through this region, in what direction must there be a component of electric field? Ignore gravity.

  08.36: An electron moves in the plane of the n:2up:/w hof*bl-sx(c kl n7 hpage through two regions of space along the dotted-line trajectory shown in the figure. Th(fbp*nc:k w2h:-/lh7on xs ul ere 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 tx wp*e4vlujy:vg*220 m lv9ndhrough a region of space containing bo2 g9dv* p: ve*2jwvxm40nluly th 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 ac t rb6tu *+u,6gijem1t constant non-zero velocity directly between 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 tum61jtg *r 6+ebcui, of the electron? Any electric field in the region originates from an unseen external source.