09.18: A wire has a conventional current I directed to the right. At the instant(jjv hym:t-fh8k -6zu shown in the figure, an elzvh: 6jukm f -8h(yjt-ectron has a velocity directed to the left. The magnetic force on the electron at this instant is

  14.24: For the bar magnet shown in the figure, which chq/,)/hhn:uijt a q;csoice best describes the direction of the magnetic field )cjhs t i/nq;,qu:ah/ at the point P located directly above the center of the magnet?

  11.34: A wire lies in the plane of the poz93n)v nkg,h age with conventional current I shown. At the instant shown, what is the direction of the magnetic force on the electron that is movi ,ngk93)noz hvng directly to the right toward the wire?

  13.30: Electrons flow to the left in a wire as shown.(l, quq8g1r: 8d9tsmo8vz agx For the proton moving toward thevzrd81t:glomxau(g, q q98 8s top of the page at the instant shown, what is the direction of the magnetic force on the proton?

  94.30: The conventional current I in a long straight wire flows in the a i 5r5 jyann5935iwxpdr5c7 mupward direction ia5j7 5xda p3ny mw55ri9 nc5ras 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 spee/lt gq4lzn(/w h5 /jis6 vn4jzd enters a uniform magnetic field whose direction is perpend5/i nljs4 gq4(//tvhjl z z6wnicular to the particle’s velocity. The particle will:

  98.10: A charged particle with constant velocity entempt.suvy a 78/rs a uniform magnetic field whose directistyav.u7p m/ 8on 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 non- zeglpaxn7 5ud- :ro electric field E is directed into g7n-apu d: lx5the 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 kgy :pk*)uw39 1ef 8n6tleld tregion of space that has a uniform magnetic field directed into the plane of the page. The proton moves directp3 dtf8*) k elygt96 el1uk:wnly 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 9i8pl0*rl hcdu(enj1 is released from rest between the poles of a horseshoe m pc ji*9rh(d08un1lleagnet as shown. What would be the direction of the acceleration of the charge caused by the magnetic field?

  10.26: An electron moving in the plane of the page at an anglcyacz-5bne ,i+ah; h; g q1s1pe 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 ,h1;asz cehy1p - cbq+gai;n5magnetic field, which best describes the direction of the resulting magnetic force on the electron?

  11.29: An electron moves witu8db jg,-oi3v wv2:z7 ) lnnkfh 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 trahvsmqr(x l.9, g,(2es3:s2uv1v iz nhkhqeu- vels at a speed v in a plane perpendicular to a magnetic field of magnitude B. The e.2 m9 he:qlvuvi3 srvh1, gsxq,(ek h (2sz-nulectron 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,:hj6kl hdz:ms-k. ,y8qpwa ;-d6mto o and speed v enters a magnetic field B and is8 qom: htmpkda:oys-.; lw 6z6jdk,h- 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 radius of the second ion’s path?

  16.44: A proton moves in a circular orbit in a uniform magnetic field B. A hei1m uxx /; jo))ohlhm(lium 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 ratio of thhhu m;moio /)(j1xx l)e speed of the helium to the speed of the proton?

  10.43: Two ions travel perpendicular to the same uniform m dgni)qzt +-q)agnetic field. The ions carry the same charge and have the same path radius in the magnetic field. Which of the following quantities must be the same for ni)gq+-)td qz the two ions?

  02.15: A positively charged particle mofd7w-/bzc*y/cb q m 2 kzoh*p2ves to the right. It enters a region of space in which there is an electric field directed up the plane of /ycfmqz*2 -7hkpczd w/b2*ob 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 kinetic energyvcnfz )s3/ rmq5,f ff,vh)p ex r7,w(o $E_k$ 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 determi vw; e00oaar)ined byew0;v0 r oiaa)

  09.27: A proton moves straight up the plane of this page into a re2t 2-(y lcwvb* t(uiokgion 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 ot(yo -(bu ilk*2c v2twf electric field? Ignore gravity.

  08.36: An electron moves in the plane of the page throughwb fzzn: p8s*o,d90iqoy e1-h1w bd*d two 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 1i9fnd*p, hw w 0ebyo:1so-zdz*dqb8(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 ,u aw-z+e,lwr constant velocity through a region of space contain wwura,, el+-zing 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 directly betweeni k;9d elcoego:kt*19 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, we*ltk:e1 o;gdock 9i9hich 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.