09.18: A wire has a conventi r1eyd.zr)d*yx0 bxf rr 7,:ewonal current I directed to the right. At the instant shown in the figure, an electron has a velocity directed tb,y y* )e:f1r.rdx0x edz7rrwo the left. The magnetic force on the electron at this instant is

  14.24: For the bar magnet shown in tesec u +tr,q: ap12hjb.*u np7he figure, which choice best describes the direction of the magnetic field at the point P locap* t +:qpa.1 hurj2, e7csbeunted directly above the center of the magnet?

  11.34: A wire lies in the plane of the page with conventio7jpkhs g .;ez,nal current I shown. At the instant shown, what is the direction of the magnetic force on the electron that is moving directl;7. pj sk,gehzy to the right toward the wire?

  13.30: Electrons flow to the left in a wire as shown. For the p5wzpb,0j9ur )xsm l b,roton moving toward the top of trbx ), s lup5jm,w09zbhe page at the instant shown, what is the direction of the magnetic force on the proton?

  94.30: The conventional currentaknfhtc( ev64+o*y 8j I in a long straight wire flows in the upward direction as shown in the figure. (Electron flow is downward.) At the instant a proton of charge+ n6ca 4v(thk 8yj*ofe +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 ehvj) -n41kpv2epkf b1f.jl9b3hyj gn+ - ,saanters a uniform magnetic field whose direction is perpendicular to the particle’s velocity. The part 21k h3 l,bfnvj1-9s)v. hyan-bg+akppfje4j icle will:

  98.10: A charged particle with const0i) ib87 gpapk :+apupant velocity enters a uniform magnetic field whos +gi p)0kp7: papaib8ue direction is parallel to the particle’s velocity. The particle will

  03.34: A positively charged particle of mass M is at rest on a table. A non- 0 v;mpshzd+8 azero 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 zp mvda8h0;s+. 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 regio3,;)lik m6dnv-ifd qpo pid/5n of space that has a uniform magnetic field directed into the plane of the page. The proton moves di,6ndq5ovf3m);idp il - pd/k irectly 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 elect.qdej-a+k q+ xz2qn 29rh7lmvric charge of negligible weight 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 magzv.q- 92hx eq+2 r qnk+lj7damnetic field?

  10.26: An electron moving in the plane w6ejq9fo 2zd2h;zh5zyu5m2e of the page at an angle of 300 to the horizontal enters a region with a constant magnetic field di;5h2zy jz2 9 defum256wzqoe hrected 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 magnetic force on the electron?

  11.29: An electron moves with ,dk-3d6+izxc mg evs* 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 travels at 9g /b uvbtc2gipu *s i0yz7 edn8nrfc19a/+w 8a 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 amountc/n d*e81 uityu 7crbvw in0bs8g92pg +af/z 9 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 ma7xj5 eby,i5qc; nesy+gnetic field B and is deflected into a path with a radius of curvatu xq e5, icyjy;e+ns7b5re 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 or6(ss)xd66:ch) :us. d5rwzfqb bktnj bit in a uniform magnetic field B. A helium nucleus moves in a nf kxdcj zsw()h:u5t6b 6rb 6)qsd:.s 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 of the proton?

  10.43: Two ions travel perpendicular to throtj xvc4* fe9j i*4 n3kkv+i9e same uniform magnetic field. The ions carry the same charge and have the same path radius in the magnetic field. Which v+9njiit*f4j3k 49 ok*xcevr of the following quantities must be the same for the two ions?

  02.15: A positively charged parm c5yoob00zslwy:c; )ticle moves to the right. It enters a region of space in which there yy0:5 zlwo0cso;b) cmis 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 mass M and kinetic eneou; x*m: rvcl3rgy $E_k$ 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 bef luv5k8,3fctvg t4 u0ta particles is commonly determined bkv845 3 ctf0 lfv,uguty

  09.27: A proton moves straight up thtfdk,jr5f ka41xu19 g e plane of this page into a region that has a magnetic field directed to the right. If the particle is undeflected a4dx9ugtr, j1a1f 5 kfks it passes through this region, in what direction must there be a component of electric field? Ignore gravity.

  08.36: An electron mov fgs ua6wds/x )p0.0lres in the 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 pldupx. flsr g0w6/)sa 0ane 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 constlw+ck.cb e;9dc-nm:u/ f tz u*ant velocity through a region of space contaic/wd mu-.ezubkclct f*+ :;9 nning 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 dire57))v/k xm;zhc6 mnsb (gal nqctly 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 m 7sqczbgkx;5/6a hln()mv mn) agnetic 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.