09.18: A wire has a cr7pr )-m2+ pe5ojfw ltonventional current I directed to the right. At the instant shown in ther5)l2f- j ptp rewo7m+ figure, an electron 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 choice best d4coz*e )eh;d. yfngmn:z5x4 describes the direction of the magnetic field at the point P located directly above the center of the ma:.d nn x zyc4e; fdgo5z)4h*emgnet?

  11.34: A wire lies in the plane of the p/c-iumc8cs r * g(u.bpage with conventional current I shown. At the instant shown, what is the direction of the magnetic force on *sg/u8 m-cp cc(ib.ru the electron that is moving directly to the right toward the wire?

  13.30: Electrons flow to the left in a wire as shown. For the proton movin rbjolr ,9wnaf248qo2g toward the top of the page at the instant shown, what is the direction jloa4oqr2b29wr n,f 8 of the magnetic force on the proton?

  94.30: The conventional current I in a long straight wire flows in the upward dihrxvx6xrn), 5j nr( d+rection as shown in the figure. (Electron flow is downwdxrx(5r jr)6nxv+n, hard.) 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 speed enteh9xzequbp9 . 3rs a uniform magnetic field whose direction is perpendicular to ex 9phbuq9.z3the particle’s velocity. The particle will:

  98.10: A charged particle with constant velocity ennl* + cmn o/njc +9j-e:pv(zjtters a uniform magnetic field whose direction is pa+ncp/jjtn -9+:mnecj( zl o *vrallel to the particle’s velocity. The particle will

  03.34: A positively charged particle ox ch7 op1 tix jo8pik85m9n8+df mass M is at rest on a table. A non- zero electric field E is d+id poxc15 8n8x h7to9ipk8jm irected 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 region97q kxvg 7kzx8 of space that has a uniform magnetic field directed into the plane of the page. The proton moves directly up the plane of the page. What is the dik kv7x 8qzxg97rection of the electric field in this region of space? Ignore gravity

  04.14: A positive electric charge of negligible weight is release oe0 4kohpnc w)vyz7q-fxs 113d from rest between the poles of a horseshoe magnet as shown. What would be the direction of the acceleration of the charge caused n zc1-s wx qoyo30f71h )epk4v by the magnetic field?

  10.26: An electron moving in the plane of t9 qw*rf2b4oe-rw pk 5-x6 btcshe 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 rb fok eq r-4x96w*wbc-2st5rpesulting magnetic force on the electron?

  11.29: An electron moves with spef tv4 g:3f0fazyl11 fqed $1.00× 10^3\: m/s$ 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 −6lj*uev4q-3m)t- m q w ldpu1r*hnxq3e 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 halfway around the circle. What is the amount of work done by3)jl q1m3utqreh4 -6nv plqmx-d*uw* the magnetic force on the electron in this time?

  97.28: An ion with charge q, mass m,jj ,b3 o obby54ilb6z1 and speed v enters a magnetic field B and is deflected into a path oob,54bi1jb j3 lyb 6zwith 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 magn2wot yd4 f++ssw6z w,m jhmt1r-2ai6:w 8gkysetic field B. A helium nucleus moves in a circular orbit in the same magnetic field. If each particle experiences the same mhi:kj8w s gwfwwz+my62+ 2 sy amo,tst4d-16ragnitude 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 perpem9nr.hfky r(k; xu ;6kndicular 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 quantik;rhkr (f9y6n ; mx.ukties must be the same for the two ions?

  02.15: A positively charan ;0zti39ccsx6sh2- jb l m)mged particle moves to the right. It enters a region of space in w6cnac st2z; ljsxmih)9 m30-bhich there 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 Mn+v0 mzy0 ,ajf and 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 parti-kai2stp q9zv 8my2d5 cles is commonly determined byya9zpi 58- v2smdkt q2

  09.27: A proton moves straight up the plane of this page into a ,rn r*;kewj*v9y9ayvvcw5 r( region that has a magnetic field directed to the right. If the part9v, wr* c5v(rv*j9w;kyer na yicle 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 p lhtug.6f7w :z-evv-h age through two regions of space along the dotted-line tra-vv7lgef hhzut w-6:.jectory 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 magnetic field in regions I and II?
Ignore gravitational forces.

  12.36: A positive charge moves with constantaqe h*dt- 2v v,wc9o3e velocity through a region of space containing bothvq-e vcoe,td9h2w *a3 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 between two lu3e)1dh or8 ,wai 2(qjn ku5ktong 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 2eorjkan(8itu15)qdku, wh 3and 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.