09.18: A wire has a conventional current I directed tfhz3+d*0, 7 kkxck eydo the right. At the instant shown in the figure, an electron has a velocity directed to the left. The magnetic force ony70,kek dx*zd3c h+fk the electron at this instant is

  14.24: For the bar magnet shown in the figure, whichgv)9li;9g5etefl l3.wjhpln)1 x6vi choice best describes the direction of the magnetic f9 vwxg3ei i)lg6evf 5 );h 1l9tpj.nllield at the point P located directly above the center of the magnet?

  11.34: A wire lies in the plane -1uqb pgu8xg q9q wp*-of the page 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 towar1w9q8gg-q*p xuu p q-bd the wire?

  13.30: Electrons flow to the lefofeh)c-7kz45+ c:;df/zal yy m k8nrkt in a wire as shown. For the proton moving toward the top of the page at the instant shown, what i7erdy mfny /;)4kz+oh z c:k5al- kfc8s the direction of the magnetic force on the proton?

  94.30: The conventional current I in a long straight wire flows in the upwar,agcl r9 6soui+j0m8xd direction as shown in the figure. (Electron flow is downward.) At the instant a proton of charge +e is a distance R frl ojs6ic, a 8+9ug0xmrom 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 fie d zrl8*8hgyop6c.j- w2g u;hold whose direction is perpendicular to the particle’s velocity. The particle wil wdz2j-.8po;8hg*oh6ry u lcg l:

  98.10: A charged particle with constant velocity enters a uniform magnetic p (o( d.mc sdc1d:sc0rfield whose direction is parallel to the particle’s velocity0dcmc: spdr.d((c1s o. The particle will

  03.34: A positively charged particle of mass M is at r8fs7q.vqjk4b est on a table. A non- zero electric field E is directed into the plane of the table. A n7.4jkq vfsb8 qon-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 regi*vey1d: w: 4w+yd4vteyt df6x on of space that has a uniform magnetic field directed into the plane of the page. The proton moves directly up the :+:vfx 4tewtw4d6d1* ed v yyyplane of the page. What is the direction of the electric field in this region of space? Ignore gravity

  04.14: A positive electric charge e z9s,wl0j72wva c cu-q-sh;u of negligible weight is released from rest between the poles of a horseshoe magnet as shown. What would be the direction of the a;9vh0ej,7uuzas cwcqlw2 --s cceleration of the charge caused by the magnetic field?

  10.26: An electron moving in the l4m2(ekn kula.h5 -2mx su+rqplane 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 r.k24qek-x + slm5ahl m(uu n2magnetic field, which best describes the direction of the resulting magnetic force on the electron?

  11.29: An electron moves with speed b ftv8vxvf7 96$1.00× 10^3\: m/s$ 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 cha,kt dibw/q7q;rge −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 radius R. In a time t, the electron travels halfw iqk7b;q d,t/way 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 q4h: eni,ov)5i sei rb9, mass m, 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 are unchanged, what will be the: ,i bsivhni )e4o5r9e radius of the second ion’s path?

  16.44: A proton moves in a circular orbit in a uniform magnetic field B. A hi j90tk p/ gi* buuk:gqmb2o(z)29yigelium 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 * y/upzt0 ki iigjb9(goq2uk)92: mbgthe ratio of the speed of the helium to the speed of the proton?

  10.43: Two ions travn2c1 5c *cdae7 pk-swfuur4k2el perpendicular 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 must be thuedr cscku4k72 *wc2- pna1f 5e same for the two ions?

  02.15: A positively t:wo85+d g .,z of 9pzdijnm8gcharged particle moves to the right. It enters a region of space in which tongd8z. :mgd98 ,5pf+jz oiwthere 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 a constant velocity?

  96.40: A proton of mass M ao-p mc;7tt2(8ystq vmhg6j * hnd 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 particles is commonly dete.,( ngu 5l(zvlj,wtnjon d *-zams5j3rmined bajnd l,3 j .szg*-zu, (lm5votjnwn(5y

  09.27: A proton moves sti,6sl8pk/ct9oqp* tz cz7 vc4 l:a+k lraight up the plane of this page into a region that has a magnetic field directed to the right. If the particleziqz l9p*al+4 ,c l/p voccsk68:tkt 7 is undeflected as it passes 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 page through tw28ggd hvm, m*io 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 madg2m,vm 8ghi *gnetic field in regions I and II?
Ignore gravitational forces.

  12.36: A positive charge moves with constant velocity through a region of s z h4-q6zlmsbi p(*/vxpace containinglz/ib4xhzv-* q6 (msp 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 m )x9q5n7zma kwv) ve**smta 2b-kf5yuoves at constant 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 directi a wq5*2tm5)-x*snmkvu 9bzeaf) v7ykon 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.