09.18: A wire has a conventional current I directed to the+40 9h c hzmq/pwy,ttz right. At the instant shown in the figure, an electron has a velocity directed to th9pt/qy0z4t hhw,+zcm e left. The magnetic force on the electron at this instant is

  14.24: For the bar magnet shown in the figure, which choice best des 1ehy 8q8vwpn.4 wpjl+cribes the direction el1qvj8p w+h .py 48wnof the magnetic field at the point P located directly above the center of the magnet?

  11.34: A wire lies in the plane of the page with c(+d 9b//uigxhdp1t xconventional current I shown. At thhc1b/xt x9gidu/p ( +de instant shown, what is the direction of the magnetic force on the electron that is moving directly to the right toward the wire?

  13.30: Electrons flow to the left in a wir e.y/wlebprv8*-la ; ae as shown. For the proton moving toward the top of the page at the instant shown, what is the direction of the magnetic force on the prop* e8;l y .ab/wrl-aevton?

  94.30: The conventional currenmn cx,7-+c.nu zl;owot I in a long straight wire flows in the upward direction as shown in the figure. (Electron flow is downward.) At the instant a proton of charge +ec, nuznoc -+mw7ol .x; 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 as 3bcd b d*h6sdmn..e6juqhr770 e j2m uniform magnetic field who7.bj*hh0m rdd6 mqsj3.n6e7bs e cd u2se direction is perpendicular to the particle’s velocity. The particle will:

  98.10: A charged particle with constant velocity enters a uniform magnetic fiken)qaapw37tn5 4oxsk+/:m ield whose direction is parallel to the particle’s velocity. /e4 :n3k+i7s5qtmpank) owax The particle will

  03.34: A positively charged particle of mor,b2 rcb 7r7vass 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 t bvr ,2rocr7b7able. 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 r yqom+lh9m:. 1nd:hfconstant 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 :lf qdmhr: m91h o+ny.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 /(rekcd)(bne 3gb.l wd /w :-a wdpm0krest between the poles of a horseshoe mcdbmeka-(/dw3 k/d) l n(. ew0wpg: rbagnet as shown. What would be the direction of the acceleration of the charge caused by the magnetic field?

  10.26: An electron movi2,wrh,dzh:f ong 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 resulting2ho,:fdz,r wh magnetic force on the electron?

  11.29: An electron moves with spee j/t; s1 )kwa8f8ud/s(nmb tztd $1.00× 10^3\: m/s$ 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 mas pgo dc8s1mddu(,,b1t s 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 the amount of work done by the magnetic fbo ,(spdd1d,m u1ct 8gorce on the electron in this time?

  97.28: An ion with charge q, mass m9z*x87ocp n v7 btxjm9, and speed v enters a magnetic field B and is deflected into a path with a radius of curvature R. If a second ion has speed 2v, while m, q, and B*877to 9xpncj9vzbmx 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 magnetivydyk9 c0ndo 0n .5sd+c field B. A helium nucleus moves in a circular orbit in the same magnetic s. d0ndy 09v+yc5dnk ofield. 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 perpend: 8wnl(s1al mhicular 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 following quantities mus m hnw:a81ls(lt be the same for the two ions?

  02.15: A positively charged 2:/tut ja5rnrol 8mz0 particle moves 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 fiel tj 5r0r /2o:zmlan8utd have to point in this region so that the particle maintains a constant velocity?

  96.40: A proton of mass M and kinetic vv0w03rivl54bf eo z; 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 commonly determinedm bebk+0bbh6 am4:o6n ct(*jy bye jk :hb6bboambt6+ (n*m0c4y

  09.27: A proton moves straight up the plane of this page ,uco 3h,ie e w-3fg5teinto 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? Ignoree 3o,-,5 c tg3hueiwfe gravity.

  08.36: An electron moves in the plane of the page through two re j vcc5r68 wb/ws1ir9fgions 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 5cifvr c rs/9j8bww16a 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 spaczcy z1xgagg *93x /tb)e cb 9g ta/g *xyxz3z)g1containing 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-zero velocity direcy1 jpqzon76ap :1k :oktly 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 andp:n761p:1oayok jzk q 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.