09.18: A wire has a cokcly:uyc9il y-v5 ws(q10)to nventional current I directed to the right. At the instant shown in the figure, an electron has a velocity directed to the left. The magnetic force on the electrolu91ckc(yi0t5o:q v)w y-syl n at this instant is

  14.24: For the bar magnet shown in the figure, which-::vta;/wojfr-lr w i choice best describes the direction of the magnetic field at thet:j:-fa;l/ ri wrwvo- point P located directly above the center of the magnet?

  11.34: A wire lies in the plane of the page with um 5,tow/1oiwvs m4 v9conventional current I shown. At the instant shown, what is the direct1/smv9 tim4o,5ou v wwion of the magnetic force on the electron that is moving directly to the right toward the wire?

  13.30: Electrons flow; z9 sd ;u24by,/1yuve stpgub to the left in a wire as shown. For the proton moving toward the top of the page at th2uybv p;/z tg db9;1 s,ey4uuse instant shown, what is the direction of the magnetic force on the proton?

  94.30: The conventional current I in a long straight wire flowsl+l93+w8y-4 hzs.sa kdgdvkl in the upward direction 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 directk kh3l8aw4v-l+yzsd.gl+d9 s ly toward it, the force on the proton is:

  95.16: A charged particle with constant speed entersknsaidy5xg9 57cmh(n+6) oml a uniform magnetic field whose direction is perpendicular to the particle kymshnc)n 6m(xd5ag5o9+ il7 ’s velocity. The particle will:

  98.10: A charged particle with co2ylvoifd x-sw(6 ; s5y q2tu:eyq n0u7nstant velocity enters a uniform magnetic field whose direction is parallel to the particle’s velocity. The particle w sv:y fl-q67ou0d une xy5qtw2(2si;y ill

  03.34: A positively charged particle of mass M is at r z0q+e+ owwleg 2;.ckhest on a table. A non- zero electric field E is direct+ 2cwqhg .e+o ;0lwkzeed 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 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 r 99je z e/eh+cbtpy.qx*iywwjn o*1 1kg,f0u;egion of space that has a uniform magnetic field directed into the p1 yj.j f9ix* +cwykt u;q wz9ghbo*1n /e0epe,lane 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 negligio6 ;x-kywzur- ble weight 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 y 6wku-;o -zxrthe magnetic field?

  10.26: An electron m r:v91ct2gmr toving 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 instant that the electron enters the magnetic field, which best describes the direction of the resultt 1c:rrtvg 2m9ing magnetic force on the electron?

  11.29: An electron moveq-:odfln ekvg*o*xpwr ;7y3 29q/iry s 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 nvd ;8- uw3f9sq2zr 6r m0tdklm 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 electr3udvr-; 62tdkfzq8snm 0l9rw on 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, mv-bb x(h,e6 h)e7xpzand speed v enters a magnetic field B and is deflectepbbm)x6 e x(7ehh,v-zd 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 circular orbit in a uniform magnetpa ::p9f58w znyd; qcgic field B. A helium nucleus moves in a circular orbit in the sa5 ndfy;p :cwg:9za p8qme 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 uniform magneti pg-nie4 vfh0 ly+1vj.c field. The ions carry the same charge and have the same path radius in the magnetic field. Which of the following quantigev-n+p0vi 4 f.j1yhl ties must be the same for the two ions?

  02.15: A positively charged particle moves to the right. It enters a region of sal- v2 gj2*q:kuif)0fcssj1 v pace in which there is an electric field directed up the pljvvsfqi2s0-* )gul1j2k f a c:ane 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 mass M and4 3lhvs90f;clfn 9vfd 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 cb4szly;f/ch;a1 4wn+hf rx /tharged beta particles is commonly determined bys;/4xf;cay4nl/z htb1 +rw hf

  09.27: A proton moves straight up the plane of thiez/mk8i.cpm0g l6 dn7s page into a region that has a magnetic field directed to the right. If the particle is undeflected as it passep m/n87cik6 mg.ez l0ds 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 po)w*8h+jon1s sscd g(age through two regions of space along the dotted-line trajectory shown in the figure. There is a uniform electric field in Region I directe)dwh n+o*ss (sogj1 c8d 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 thshl7.7a mgab-8sr69r onbd :drough a region of space containing both an-rlhr8 n bad 7os 9m7b.s:dga6
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 cylak,p7r:d8 x g i,,cbpdiz5 )onstant 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 the electrbz8gy pd :x5, ic,dli)7 ap,kric field that exist at the location of the electron? Any electric field in the region originates from an unseen external source.