09.18: A wire has a conventional curjiimt+ b u6*,mrent I directed to the right. At the instant shown in the figure, an electron has um6bii, m+*tja velocity directed to the left. The magnetic force on the electron at this instant is

  14.24: For the bar magnet shown in the figuretan7r ;3 eydhj+4m bluuea5ex*+pd .4, which choice best describes the direction of the magnetic fielhl +mp+ b 4je3de*aydat;5u.re4 7xund at the point P located directly above the center of the magnet?

  11.34: A wire lies in the plane of the pagy,jhu/u8ksylnq:1 s:e h3 s )je with conventional current I shown. At the instant shown, what is the direction of the magnetic force on the electron that is moving directly to the right toward yj q:)uynlhe3h 1k8s,/j ss: uthe wire?

  13.30: Electrons flow to the left in a wire as shown. For tonfmcsv*qkie m4o*6wu*d 7 iap)6h3 xw. l:a; he proton moving toward the top of the page at the instant shown,m.:ql*fhwi*a ;7 xp3 dwvu6*ks o6m4ina)eo c what is the direction of the magnetic force on the proton?

  94.30: The conventional current I in a long strai u975we 7g2nu1kxr d *okgabm0ght wire flows in the upward directiona0 bn2o7m1gdwge*ku 759kr xu 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 it, the force on the proton is:

  95.16: A charged particle with constant speed e/nx0;rf yqy(enters a uniform magnetic field whose direction is perpendicular to the particle’s veloc0yeq;/rxy f( nity. The particle will:

  98.10: A charged particle with constant velo58x)gu y 08d1pj/ygop;4qsqb3 h asge.ei*hc city enters a uniform magnetic field whose dire dyggc* esg/8psh.qyb803 hqxeiu p 1a)4jo;5ction is parallel to the particle’s velocity. The particle will

  03.34: A positively charged particle of mass M is at rest on a table. A k0us .;gl3vtp -2 zpzsnon- 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 islutg ss2v- 0k3z;ppz. 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 x r +fg p)b7nn1f smsw:t(ij3;constant non-zero velocity in a region of space that has a uniform magnetic field directsf(wnjbpts ;:31n)mxi g f +7red 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? Ignore gravity

  04.14: A positive electric charge of negligible weight is released from rest b agk i,4s5 9pyia,hun 6at4g4cetween the poles of a horseshoe magnet as s 45 44sca yph,,ggkaui96 antihown. What would be the direction of the acceleration of the charge caused by the magnetic field?

  10.26: An electron moving mrrsznx,zu q *.l4(fmz2/ko.in 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 mqn/4zz..*rro(k zfx musl,2instant that the electron enters the magnetic field, which best describes the direction of the resulting magnetic force on the electron?

  11.29: An electron moves witl- v-n agzvmd:umjdg0aj. 0*a ; 5dds6h 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 speed v in a plane perps2y.xx7/vhwidv.j9 a5x gx.cendicular to a magnetic fie 7j hd ixyaw.c25xv.s9xg x/.vld 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 B and g)yn,p)y mb ,kis deflected into a path with a radius of curvature R. If a second ion )gyk by,p n)m,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 uniform magl/h wzm +fv6hhj (-xw0netic 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 ratihvj6hz-f+hwm / l0 w(xo of the speed of the helium to the speed of the proton?

  10.43: Two ions travel s ws;a46bj 6k2cvs1wkperpendicular to the same uniform magnetic field. The ions carry the same charge and have the same path radiuskb12ww j;kassc6v4 6s in the magnetic field. Which of the following quantities must be the same for the two ions?

  02.15: A positively charged particle mj jor17t(ig xgt*( n7doves 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 particle maintains g(r nj*x7t1ojti7(g da constant velocity?

  96.40: A proton of mass M and kinetic endidll 85 gb8,eergy $E_k$ 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 part2 aw gmw7mran mxde 035v.,uo -jz)1yhicles is commonly determined b1m) h-d70 r,wonexmwvzg2.j my5 3a auy

  09.27: A proton moves straight up thdajog9r* qe/p+s:uk,p3 e 4+wzw ko5h e plane of this page into a region that has a magnetic field directed to the right. If the particle is undeflected as it passes through this region, in what direction must there be a component of electric field?*ug: e9rdqw3+zw khkp/ ajop s+,eo54 Ignore gravity.

  08.36: An electron moves in the plane of the page through two regions of space59:ujkm3ocu 4sql0j l 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 (a:kus 0j354ljmcqlu o9 s 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 ve)2 xn//x0;gcgq nr4nlwceax) locity through a region of space containin cnnl w/ ngg2/x4 rxq)0);ceaxg 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-zer uf)yow0q zil-74h ci3:ijw1yo 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 4 i1-iqfhucwy z:7y o30jwi )lthe 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.