09.18: A wire has a conventional current I directed to the right./xhc:54 5ez ky*t:n xrz4c mcr At the instant shown in the figure, an electron has a velocity direczkx *5t :yzrc mhc4e54 /n:rxcted to the left. The magnetic force on the electron at this instant is

  14.24: For the bar magnet shown in the figure, which 8 tu6ie 5lq3jd)jbb8o choice best describes the direction of the magnetic field at the point P located directly above the center of the magnej q j5d8ibt6b)8o3 elut?

  11.34: A wire lies in the plane of the pagr*d31fdq qy v0e with conventional current I shown. At the instant shown, what is the direction of the magnetic force on the electron that is moving directly f d30dq*1q vryto the right toward the wire?

  13.30: Electrons flow to the left in a wire ase8 o r4dlrvzor ,2:0gm shown. For the proton moving toward the top of the page at the instant shown, what is the direction of the l:e,480mro2 gvorzrd magnetic force on the proton?

  94.30: The conventional current I in a longk3:txw/5tkimy e /z/u straight wire flows in the upward direction as shown in the figure. (Electron flow is downward.) At the insk/ mi/ e /ky3:ztwtx5utant 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 particv1x nx u2l-qf;le with constant speed enters a uniform magnetic field whose direction is perpendicular tq -vln;x1uxf2o the particle’s velocity. The particle will:

  98.10: A charged particle with constant velocity enters a uniform magnetijz.m2dj 1:c19 qm +)tdd:t qpwkfs6cg c field whose direction is p) s6:1k tcqg+jdz .tdmfc:wq2m 1 9jdparallel to the particle’s velocity. The particle will

  03.34: A positively charged particle ozi,r,( gd1eho f 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 tg(e 1 d,,oizrhhe 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 c*k )af7. s+ds/cam:;zwhn wtrhs( k*a onstant non-zero velocity in a region of space that has a uniform magnetic field directed into the plane of the page. The proton moves directly up the )m;ka:tk.c ssrzd7hf* ww+*shn(a/ aplane 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 releq: txc,h ohf3tn-eg, 2 p,xh,kased from rest between the poles of a horseshoe magnet as shown. What would be the direction of the acceleration of the chp-n 3,fotk,th,xg,e2q :xchharge caused by the magnetic field?

  10.26: An electron moving in the plane of the page at an angle of 300 to the 4zq, p :uma:jwhorizontal enters a region with a constant magnetic field directed horizontally in the plane of the page as shown. At the instant that qajuwzp:4m : ,the electron enters the magnetic field, which best describes the direction of the resulting magnetic force on the electron?

  11.29: An electron move7 h2d srci0zk)j.b6p* rz5x+hkq j.wvs 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 -/xdr 7cj+z) qeyg /lgmass 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 +c/e)r lxgy/jd-z 7g qthe amount of work done by the magnetic force on the electron in this time?

  97.28: An ion with charge q, mass * ry:zkl,4 mmr6k -hsom, and speed v enters a magnetic field B and is deflected into a path with a radius of curvatur rhlm-6y zk*mko:sr,4 e 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 circular orbit in a uniform magnetic field B. A heli 38ru uksmg4j kier8)od2,lr (um nucleus moves in a circular orbit in the same magnetic field. If each particle experiences the sa8 glu3ks(ie ou8jr,4rmk 2)d rme 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 perpendicd*q8ub/ wlp 4dular to the same uniform magnetic field. The ions carry /*dplwb 4qdu8the same 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 moveg 17 ) h5k*/vo*(oxnx ttm3lf- dvysius to the right. It enters a region of space in which there is an electric field directed up the plane of)*onvxus/( yh5iv*t7 dmkot fg31xl - 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 mass M and kl,/0 -2i-db qa ituwyqinetic 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 particles is j r idimy76*/o,3ynyc commonly determined b*c/y3 j ri7idom y,yn6y

  09.27: A proton moves straight up wu/f9 k -rl;ejca(67oltz 4 nrthe 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 fiel z/o(a uk9r4nfe7r;-j l 6tclwd? Ignore gravity.

  08.36: An electron moves in the plane of the 5(.f-. nz1 sr.. hqb7 vx jtozducd/yipage through two regions of space along the dotted-line trajectory shown in the figure. There is a uniform electric field in Region I directed .d1ux .f-5h (n7zv.ziq s/.robydt jc 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 hu wpm e6dy d7)* v5dyi:f:lx0of space containing both e 6: dml*xdufy0 h:) y7iwdp5van
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 directl7)h e-g:xatb wgc:l-jy between two long:ctwaxl7j -heg: g)- b 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 the electric field that exist at the location of the electron? Any electric field in the region originates from an unseen external source.