09.18: A wire has a conventional cur0psj)fpy// i h76:7b yu+swunpm4j norent I directed to the right. At the instant shown in the figure, an electron has a velocity directed to the left. The magnetic force on the electr4n/:/7y7swmsb0 h 6nj )yjpoup puif+on at this instant is

  14.24: For the bar magnet shown in the figure, which choice best describes hfg-/l y2 k9zvthe direction of the magnetic field at the point P located direfzk2y vl /-h9gctly above the center of the magnet?

  11.34: A wire lies in t0sxx:eu9 zxo +jsmh() he plane of the page with conventional current I shown. At the instant shown, what is the direction of the magnetic force on the electron that is moving di9 x)e(ssxh0: ujzx+om rectly to the right toward the wire?

  13.30: Electrons flow to the left in c7 kw5m*a i*qba wire as shown. For the proton moving toward the top of 7w *im5kb*caqthe page at the instant shown, what is the direction of the magnetic force on the proton?

  94.30: The conventional cule6nt cm+t k: p-mvs6q k ef1ms;yq g)v/jp57,rrent 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 +e is a distance R from the wire and heading directly toward 6mvs);k+p e /vmt, mqqsejl5n:tck16-f 7 py git, the force on the proton is:

  95.16: A charged particle with constant speep(o18gct ty3nx n6,n)hbu rl (d enters a uniform magnetic field whose direction is perpendicular to the particle’3y r 8tx6ogl(nh)1pt (n,bunc s velocity. The particle will:

  98.10: A charged partws w )bfk6t51zhsv1i 6icle with constant velocity enters a uniform magnetic field whose direction is parallel to the particle’s velocity. The particl6 61 )f1tvhbisswz k5we will

  03.34: A positively charged particle of mass M is at rest onvalp t*3k-cxifjn* ) 6 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 ofnkl -fxip) t3a*vcj *6 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 m da y477p)la)z is0orconstant non-zero velocity in a region of space that has a uniform magnetic field directed into the plane of the paadpmosy r)al47 )07zi ge. 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 releasvube/w )/rubc8ye/7glmr8 ae6aed*c h 02p1e ed from rest between the poles of a ure6 )88lc7eahd1v/b*0/ yeaber/ 2 cu gwpemhorseshoe magnet as shown. What would be the direction 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 of 300ewb) wmq;2sk+: x an)id .c)dq to the horizontal enters a region with a constant magnetic field directed horizontally in the plane of the page as shown. At the ind bq; ew.)s:qx)nk w2 +)aimcdstant that the electron enters the magnetic field, which best describes the direction of the resulting magnetic force on the electron?

  11.29: An electron move c( *gz izb esbc.qeny-)sr59/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 with charge −e and mass mn .cmln0gk +.yj6,l iw2h,ir d 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 r.,iydn0 n6 +g,2mj.clkhiw lof work done by the magnetic force on the electron in this time?

  97.28: An ion with charge q, m0eujx7 yiw((3s p6rs.zpik y -ass m, and speed v enters a magnetic field B and is deflected intp-0.sk uj ew76r 3ixi( yyp(szo 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 f 7ueloa vf,:-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 he vaf-f:,ulo7e lium to the speed of the proton?

  10.43: Two ions travel perpendicular to the same uniform magei8hrlhi; s7 fyu3xtm zl8346netic field. The ions carry the same charge and have the same path radishil8h3u;z74i3el6r y tmx8f us in the magnetic field. Which of the following quantities must be the same for the two ions?

  02.15: A positively charged part jhd -9ag *ux0u5xl:ocicle moves to the 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 direc09a5gjuc oluh-x *xd: tion does a magnetic field have to point in this region so that the particle maintains a constant velocity?

  96.40: A proton of m/xkb0kw. qq/aass 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 elemj/et e+cc7oo+ p+i e-ctrically charged beta particles is commonly determined bycm++oiee+/-oetj 7 p c

  09.27: A proton moves straight up the plane of this page int od+,3p0asqxar )i2cnp) lb)ao a region that has a magnetic field directed to the right. If the particle is undeflected as it passec,i2od)lbr 0aq3saxp)p +a ) ns through this region, in what direction must there be a component of electric field? Ignore gravity.

  08.36: An electron moves in the plane owj9k 7bv-qlgj kq;hs(3./nkd f 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 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?b(j 3kg-7k q;s9vhln /jk.qdw
Ignore gravitational forces.

  12.36: A positive charge moves with constant vev:n4+aw f;y ntlocity through a region of space con; vwfnyat 4:n+taining 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 do -8b r6kkf6 sgb 22kh64x,nxss6kgujirectly 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 thg6h-ub,6xsn668kxkfgsj s bk42 k2o r e 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.