09.18: A wire has a conventional current I directed to the right.i)fd.z58g6x avri, wo io rk36 At the instant shown in the figure, an electron has a velocity directed to the left. The magnetic force on the electron .ow 8riavo ,65xgkid36i zr )fat this instant is

  14.24: For the bar magnet shown in the figure, which choice ben :8tuw3spk8wwbd,c4 vn)b (rst describes the direction of the magnetic field at the point P located directlnww8s4 bwpc (:)u b8n3r,vkdty above the center of the magnet?

  11.34: A wire lies in the plane of the page with conventional current cnru ,q:b +c95o f w*xj(ul3fgI shown. At the instant shown, what is the direction of the magnetic for :ng5(uu +*lcjfc,bwox q93frce on the electron that is moving directly to the right toward the wire?

  13.30: Electrons flow to the left in a wire as shown. For thy7rpt 5sp 3 lqc,f w.6:ecfct6e proton moving toward the top of the page at the instant shown, what is the c: qt66cw.3efly ,ppscr5 7tf direction of the magnetic force on the proton?

  94.30: The conventional currea51w 0r d.:vj oneix9efx, /vmnt I in a long straight wire flows in the upward direction as showxo/r.ev59vxifdeam w, j 0n 1:n 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 particle with constant speed enters a uniform magnetic fiee:1g r-9a5vs r/xvd sqld whose direction xqv9v/-g er:ss5r ad1is perpendicular to the particle’s velocity. The particle will:

  98.10: A charged particle with constant velocity enters a un5 +7kzvshbny ,/ue ge0iform magnetic field whose direction is parallel to the particle’s v e,sbu+zk veg5/hny7 0elocity. The particle will

  03.34: A positively charged particle ofr9; *)gaofghhr)g j 7f mass M is at rest on a table. A non- zero electric field E is directed into the p7r*a; j9gh hgr)of)fglane 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 region ug;d in+y-ydf/ 9rif; 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 s /ffu-rdd9gyn;iy ;+i pace? Ignore gravity

  04.14: A positive electric charge of negligible weight is releases/)zf ewp+ xy+bx :ozoct+a*/ d from rest between the poles of a horseshoe magnet as shown. What would be the direction of the acceleration of the charge caused by *:)e+wo bfx+o/ts pyazxzc/ +the magnetic field?

  10.26: An electron moving in( iq0in(g lb3j the 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 mag(bqi0gn jl3i(netic field, which best describes the direction of the resulting magnetic force on the electron?

  11.29: An electron moves with spemx;i(5wprqjr,e/q c sb we,9 0ed $1.00× 10^3\: m/s$ 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 witkg,qh+5 yel k/h 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 radiuk5,e q+yl h/kgs 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, an)bv gfiw.3fvhcn:7s wyc -m*0r6 4h df. :xhcnd speed v enters a magnetic field B and is deflected into a path with a radius of curvaturefwn:rh.fvnd6 :i0m . yhg4 h vw-s3x *7cccbf) 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 cirhzotps)g r.46 c8e tg-2fs h)zcular 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,g .ezzgsc4t6hos) h p)-r2f8 t 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 uniform magnetic field. x:cn8p mjatk hfy m8o+,u(-o3The ions carry the same charge and have the same path radius in the magnetic field. Which of the followt 8kmo8xmj pc( o+f:,uyh3n-a ing quantities must be the same for the two ions?

  02.15: A positively charged particle moves to the right. It enters a regiore1 av:43cxgt n of space in which there is an electric field directed up the plane of the paper (see figure). In which 4xrat 31gv ce: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 an9q sd+s pqwi scg6q*00d 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 partic*ev ,-9ilu likqm7 fo;les is commonly determined blo *;ekvufiqi 9ml7,-y

  09.27: A proton moves straight u tayqi. u spv;5nu+30f1b2 dtnp the plane of this page into a region that has a magnetic field directed to the right. If the particle is undeflected as it pa 2s503n. ytq uituv;nbpd f+1asses through this region, in what direction must there be a component of electric field? Ignore gravity.

  08.36: An electron moves in the plane r3 bz. 5.x*lo0oi gexeof 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 fieldzl35x. xi reob.oe0g* in regions I and II?
Ignore gravitational forces.

  12.36: A positive chargex.i7m u9hh4 me moves with constant velocity through a region of space containing botim9xh.4 7umh eh 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 directly betwenemufm(l:x o/ 9n( q8oen two long straight winnxlf (( 8/m9o:qoemures. 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.