09.18: A wire has a conventional cuh ,(dxmbm5hp1 rrent I directed to the right. At the instant shown in the figum5(bm 1xp ,hdhre, 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 the figure, which choice best describe*p4fppzo2 0d1f i2 vzas the direction of the magnetic field at the point P located directly adzp p vaifo0z1pf4*22bove the center of the magnet?

  11.34: A wire lies in the plane of the 1ddlw7 32 g x*1buuhvmpage with conventional current I shown. At the instant shown, what is the direction of the magnetic force on2u ul3x*1wmb h1 7gddv the electron that is moving directly to the right toward the wire?

  13.30: Electrons flow to the left in a wire as mhge4y o5m/ wktfz)6pxfms3v ( 8.2idshown. For the proton moving toward the to6k d o/f5zfmhvem3m28y g )tpwx.(is4p of the page at the 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 /6 a a 7qbossxw5jc1h857gwzethe 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 i aqcwbzj15s/s h775 ox68gw aet, the force on the proton is:

  95.16: A charged particle with c v,gmyp d;thxv/;m9t7onstant speed enters a uniform magnetic field whose diret,gymhmp;9/xv dvt7;ction is perpendicular to the particle’s velocity. The particle will:

  98.10: A charged particle with constant velocigl5 0abpku(yup 6- wha7b/2hrty enters a uniform magnetic field whose direction ip w u6u/kabh-hl p 0g2a75rb(ys parallel to the particle’s velocity. The particle will

  03.34: A positively charged particle of mass M is at r92 xihna. p2pkest on a table. A non- zero electric field E is directed into the pi9pa kn2h.2 xplane 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 rkh6-/o; ygjr1wv-z6 -w7nvm; bk o rvoegion 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 ;-w1;on/6rkh zv6og yjvbvm7 --or kwelectric field in this region of space? Ignore gravity

  04.14: A positive electric charge of negligible weight 2n4u52 yf om5 .uahgevis 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 fie 5y 2u.agm h4fn25uvoeld?

  10.26: An electron moving in thetv3oqwew7d pnr -n*1+ffe2y2 plane 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 direcn1feerow+2n7y3 tq dv -2 *pwftion of the resulting magnetic force on the electron?

  11.29: An electron moves witkv q581 cjn 3:uy9bpbnts6np9h 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 p /3zcn b0o,cnch-bsr:sx cepel466 ,at a speed v in a plane perpendicsle/:cbrs4z, p hbn6-c6p0,cc 3nxoeular 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 magnetic field 4houfxg ;uve5+x3y x5) tci3qB and is deflected into a pae 3gy5 3o+th;)4uvx5fq ixcux th 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 ;5opjesc.,2s e8ewn q psa8v,circular orbit 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 speedp5aeo2;.8s ,,wvjes q8cpse n of the helium to the speed of the proton?

  10.43: Two ions travel perpendicular to the same n)4afr yy ;;pp+ 5il.o/lvy ysuniform magnetic field. The ions carry the sampyi nrla4;s/ y; +vy5 ).ylpfoe charge and have the same path radius in the magnetic 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 otmea7r j*7 ,p4i ozrh+f 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 this region so that the particle maintain77orza* ,hj 4etpir+m s a constant velocity?

  96.40: A proton of mass M and kinetic ene28z- h iyjbm9k5l9gnvrgy $E_k$ 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 particlesy2icz6:y gl;ui:fyv:d-ck xu0 d.ot , is commonly determined bcd;6ytuuz l, .f::2:c-iyoyd ivkg0xy

  09.27: A proton moves straight up the plane of this pag9digr5u8upbft 5r:lpm 3( -x ie into a region that has a magnetic field directed to the right. If the particle is undefurid(m t-:bplr553ug8pfx 9 ilected as it passes 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 page throu8exlh w7,zg cxq:jrsw p**l(/gh 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 magnetigx8w j , l(x/*pzcehs:rqw*7lc field in regions I and II?
Ignore gravitational forces.

  12.36: A positive charge moves 7/64 e 0tzgo6pvie ncj+.(*blch cfwuwith constant velocity through a region of space containing both an l6h ceecj4p nzf(o+g*iu6/vw7.t 0 cb
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 constanlnhgqb 2h+/loj +4lb 2t non-zero velocity directly between two long straight wires. The conventional current in eac2b 4+2lj/+qhlnlg bhoh 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.