09.18: A wire has a conventional current I directed to the rig 8gr nc* )2+ j)cgovsdk:(dcra(dx ol;ht. At the instant shown in the(c ax s+ drv okgcn(*g)d;ldrj 2c):8o figure, an electron has a velocity directed to the left. The magnetic force on the electron at this instant is

  14.24: For the bar magnet shown in t a,n episf31:s 1ws tq z(lkpg1:c9,rwhe figure, which choice best describes the direction of the magnetic field at the poin,p,n9:lw:1 3(wr ssa 1czsgp eikfqt 1t P located directly above the center of the magnet?

  11.34: A wire lies in the plane of the page with conventional current I svbaq rx1 p34m+jmvoy1s; a5q1hown. At the instant shown, what is the direction of the magnetic force on the electron that is moving directly to the right toward bjvps aqr m1 ;xoy534vm1+qa1 the wire?

  13.30: Electrons flow to the left in a wire as w9k +0gjlzqtv5d )3joshown. For the proton moving toward the top of the page at the instant shown, what is the direction of the j3qz09l)kdv5t + owjgmagnetic force on the proton?

  94.30: The conventional current I in a long straight wire flows 2brp7p*t9sg1c io:d jin the upward direction as shown in the figure. (Electron flow is downward.) At the instant a 1bdgipo:sj2tp 7c* 9r 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 enters a uniform magnecw,g d;j:kcvtj:3ud.m weut,0 5w d+etic field whose direction is perpenm d 3w:.jjw+ec; w0u,eudkdt:5tc g v,dicular to the particle’s velocity. The particle will:

  98.10: A charged particle with constant velocity enters a uniform lt dq n;)u99uemz5mvysn 657mmagnetic field whose direction is ) ;9 lums7mmuqvdzn6ey tn 595parallel to the particle’s velocity. The particle will

  03.34: A positively charged particle of mass M ela a1js dg37-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 the plane of the table. What s3ala- e17 djgis 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-zew/4 *4 sr +i1ufglb+r haxj9fgro velocity in a region of space that has a uniform magne+xi9rr1s+jg*abwl4f h f g/u4tic 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 in this region of space? Ignore gravity

  04.14: A positive electric charge of negligible weight is released from rest 0t-r*v 1lwvyy1t we/k between the poles of a horseshoe magnet as shown. What would be the direction-k1w/l1 yw tevv t*ry0 of the acceleration of the charge caused by the magnetic field?

  10.26: An electron moving in the plane of the page at an angle oft9tbt:4((pwqy iass owl 77n 6 300 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 resultingt97ops7 :4bi( yt t( nlws6waq magnetic force on the electron?

  11.29: An electron moves with spequhhny hp,*sdv t3 /s4/:li w rw;2x4jed $1.00× 10^3\: m/s$ 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 a speed v in a pland0cm(l+8b rdbe perpendicular to a magnetic field8bm (ld0r+ bdc 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 magnetic field B38t3 g;6wt x mdmpn+iu 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, whntumw;p8mg6 i+ 3 t3xdat will be the radius of the second ion’s path?

  16.44: A proton moves in a circular orbiu)kz9i s o-pk1t 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 motion, what is the ratio of the speed of the -)ou19s zkpki helium to the speed of the proton?

  10.43: Two ions travelu4 v-r r-satij42 qrn, perpendicular to the same uniform magnetic field. The ions carry the same charge and have the same path radius in the mv,4arjni- srtu2q r4- agnetic 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 region of e1 7e5-fvn dlpspace in which there is an electric field directed up the plane o157 nv-defelpf 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 ch;vyb)d)ibn5zn )(s 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 particlebxc1vd20 )yvchj+k +hu+plx6 s is commonly determined bh 1yb+6) vx20p+uh xkjc vdcl+y

  09.27: A proton moves straight up the plane of this page into a regivcv +;4u fcar;on 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 be a component of electric field? Ignore gravity. acfv c;r+vu4;

  08.36: An electron mo0 nd.xsq pn)vj*94xjnves in the plane of the page through two regions of space along the dotted-line trajectory shown in the figure. There is axnjdqn4)npjvs. x*90 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 wpz6lzs:k1 c0yhy f*n3y( at3with constant velocity through a region of space containinkynlw0 :(6 zf1s* p3yy3hzca tg 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 movesut,4j reas *w/ at 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 of the electron? Any electric field in the region originates from an unseen external source. ,wa/s *et4ru j