09.18: A wire has a conventional current I directed to the righ4odkmyaj:i; yh:i n; (- v*qqtt. At the instant shown in the figure, an electron has a velocity directed to the left. The magnetic f qyi-ymd:a( 4;inq;ovjth :*korce on the electron at this instant is

  14.24: For the bar magnet shyz ,( -tj0)fl z4;ke8 jgsftdhown in the figure, which choice best describes the direction of the magnetic field at the point P locatedzfk,s(4f jjd8l)te yz;-0ht g directly above the center of the magnet?

  11.34: A wire lies in the plane of the page with conventional current I svs.5o3yjgm 4nfa;n+v +md0l pht9z,dhown. At the instant shown, what is the direction of the magnetic force on the electron that is moving directly to the right to. gph4+zjao,+ 9nml0 5v;3vdym dfsntward the wire?

  13.30: Electrons flow to the lefa p9 2 (e1lav) qzuc1p(rfbx;pt in a wire as shown. For the proton moving toward the top of the page at the instant shown, what is the dir1pv9rqf2x pzpe) 1ua(b (ca;lection of the magnetic force on the proton?

  94.30: The conventional current jnkv:(tbpx0ew;u 0l x t3r7:nI in a long straight wire flows in the upward direction as sl(r :xu7k t00ej;xwvt:p nb3n hown 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 it, the force on the proton is:

  95.16: A charged parto8e 4nlpsv73oicle with constant speed enters a uniform magnetic field whose direction is perpendicular to the particle’eonso v7lp3 84s velocity. The particle will:

  98.10: A charged particle with constant velocity enters z+c.sov. z8ct a uniform magnetic field whose direction is parallel to the particle .zc tz.v8soc+’s velocity. The particle will

  03.34: A positively charged particlkggw+3g6wm. vvcsb*) l7wm7 n e of mass M 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 is true about the magnitude of the electrw73 m.kg7wn )b +c*mvgwvl6sg ic 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 am usnc/v;g t.4 region 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 electric field in this region of space? Igm /4sgv ;.cutnnore gravity

  04.14: A positive electric charge of negligible weig6 sqyj6q(eu d/ht 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 magne/6(yedu j6qsq tic field?

  10.26: An electron moving in the plane of wul h38y k 7o)pr*ue5lok1* asthe page at an angle of 300 to the horizontal enters a region with a constant magnetic field directed horizontally in the plane of thsak u7o lwol*yr*)58u3hpk e 1e 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 move-mjusd()lg wqdm7r (b8(md ;ls 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 m travels at a sperrrh y s(3y2b)ed 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 ma yr( bsrhry3)2gnetic force on the electron in this time?

  97.28: An ion with charge q, mass m, and speed v,8jm.ow qfz2m**wx vn enters a magnetic field B and iszjwqnm.8wo xf*vm*2 , 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 a tn5twchg+l(x ;gy3r. 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 magneti5.c+r3wtn (gy l;th gxc force during its motion, what is the ratio of the speed of the helium to the speed of the proton?

  10.43: Two ions trav7v/;cepc6syd z c -bti3gz21k el perpendicular to the same uniform magnetic field. The ions carry the same charge and have the same path radius in the magnetic field. Which of the followyzctkc/362 ;z7ibde1-cg s pving quantities must be the same for the two ions?

  02.15: A positively charged particle moves to the right. It enters a r n x84lmugu2dlb* lo7yuh8, 0fegion of space f2l 847ounlludymg u,h08 bx*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 maintains a constant velocity?

  96.40: A proton of massaaq j;+3wr ow0 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 electrically charged beta particlesj/c 4 qse+n26 ,lwvjsb is commonly determined bjv+lscseq, j426 w/b ny

  09.27: A proton moves straight upej*9vho. o ;* ae a(8mr/au;plouoji3 the plane of this page into a region that has a magnetic field directed to the right. If moauo;u93/.e l8 a*epha i;joo(r *jvthe particle is undeflected 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 throzbx h (cke4nnhve-4ek )i, 9auoig/4-ugh two regions of space ai(gn4 ko hehxkbv-a/4eu) zic, -e 94nlong 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?
Ignore gravitational forces.

  12.36: A positive charge moves with constant velocity through a region of spanri7nu2, 5(m; rh fvlgce containing both an v;,ng iuh7(25rmfnrl
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 dyei;odrtk k+.n )j/-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 th .+nyktd rokdiej/; )-e electric field that exist at the location of the electron? Any electric field in the region originates from an unseen external source.