09.18: A wire has a conventional current I direc;t7;b+m jqtfs syr1u3p5 r:yz ted to the right. At the instant shown in the figure, an electron has a velocity directed to the left. The jf+y5 7 mp;rbqr3u; t yz:t1ssmagnetic force on the electron at this instant is

  14.24: For the bar magnet shown in the fi03 ih9n7ojnufgure, which choice best describes the direction of the magnetic field at the 37nnhiuo9 jf0point P located directly above the center of the magnet?

  11.34: A wire lies in the plane of the page with conventi9 er;:arsme c:onal current I shown. At the instant shown, what is the :acrm :;ere 9sdirection 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 shor4/6a;w nvgo,e0 w3uwmy+nb t wn. For the proton moving toward the top of the page at the ins6b0ma;wu+to g3w4v /nw ryn,e tant shown, what is the direction of the magnetic force on the proton?

  94.30: The conventional z2i* twu xxogi5c,c m))+ww jzb/h2f: current I in a long straight wire flows in the upward direction as shown in the fig/wcu 5:tc,wxfx*2b)2m+ g iz w joihz)ure. (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 enters a un sf7ezw .ws20oiform magnetic field whose direction is perpendicular to the particle’s veloc7sw0ze.owf 2 sity. The particle will:

  98.10: A charged particle with constant veloca)x u,mm-(k 5 sfcpij1ity enters a uniform magnetic field whose direction is parallel to the particle’s velocity. The parti-)im 51axp ju( f,mskccle will

  03.34: A positively charged particle of masi - m1ks6)h+tvltxb1ss M is at rest on a table. A non- zero electric field E is directed into the plane of the table. A nl1xmsbh -kvti6 )+1tson-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 space y+mar x+0w h7se . mw6nkv-q7jthat has a uniform magnetic field directed into the plane of the page. The proton moves d.w-7nsa kw 0 mrjxmq hy76++veirectly 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 c/cr -ukvosi9. */;:sl0bnavb nbol5jharge of negligible weight is released from rest between the poles of a horblko.v: r0nuain j;*sbb/-ov9c5l s /seshoe 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 300 to t+dq *cnr ed.r-:f3 cdkhe 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+drk:c *qed cf.3rnd- of the resulting magnetic force on the electron?

  11.29: An electron movesm951 :nny0vug ul4znh 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 wii2n,0b9y1ve ovaph w8 th charge −e and mass m 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 of work done by the magnetic force on the electrononh9pw yevb i0281 ,av in this time?

  97.28: An ion with char q2)e.0zjt mfjvq2u* gge q, mass m, and speed v enters a magnetic field B and i0euz)v*.2 2q jq tgfmjs deflected into 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 a0w f3fy-l55c// *;eo ls z+kvclsqgua circular orbit in a uniform magnetic field B. A helium nucleus moveyeqa*o l;c/ 3lf s u/f0+c5v-szgl kw5s 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 helium to the speed of the proton?

  10.43: Two ions travel perpendicular to the same unifw724ati +qq h rldp ij54,feg/orm magnetic field. The ions carry the same charge and have the same path radius in the magnetic field. Which of the following quantities must be the w2f/jpi ,heag54 rd+7i tq4ql same for the two ions?

  02.15: A positively c3chch-wt fzh r (2j/l1harged particle 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 direction does a magnetic field have to point in this region so that the particlh2 t/w1hh3 fcc(zlr j-e maintains a constant velocity?

  96.40: A proton of mass M and kinetic 2mwxoz d69 ioi38 tdk+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 particl-b::gkpfzy+ e es is commonly determined bzg::f ybe-pk+ y

  09.27: A proton moves straight up the plane* 9b5s,h4c) + q5rt xunkjbkke of this page into a region that has a magnetic field directed to the right. If the particle is undeflected as it passes through thi kxkr 9ujh+,4bnkc)*beq 5t5ss 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 zcll t(sfw2znv,8p0,o5nv9 j+hnp w7through two regions of space along the dotted-line trajectory shown in the figure. There is aowlvc,( wh 7vz+p nnpz 0l5 j982snt,f 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 conslb:p*tknge-: ktl )3ntant velocity through a region of space containing bot3nkn ll tgk:teb:*- )ph 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 cons;8c,b rgy im+fp:m:z ttant 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 showg m ipt+ bm8:f,:;cyrzn 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.