09.18: A wire has a conventional current I directed to the right. At the insnx05x )d 9yjeftant shown in the figure, an electron has a velocity directed txn9 dj fx0)5yeo the left. The magnetic force on the electron at this instant is

  14.24: For the bar magnet shown in the figure, which choihw:z,h5eu c:0)frs h mce best describes the direction of the magnetic field at t ,hz5me ) hs0:hrw:cfuhe point P located directly above the center of the magnet?

  11.34: A wire lies in the plane of the page with conventional current Ir:ao,5lk+.6wh( r gplnx wem4 shown. At the instant shown, what is the direction of the magnetic force on the electron that is moving directly to t5(k4l+a o r :ngxwe ,hr6m.wplhe right toward the wire?

  13.30: Electrons flow to the left in a wire as shown. For the proton mo n:be1v7vs*(9 dm ynjaving toward th*v mnj:vy(aed7s 9n1 be 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 amz r-n(j (u 1vls ot(xn:7u6ga long straight wire flows in the upward direction as shown in the figure. (Electron flow is downward.) At the6la1vz:u( r7s ntmgojnux-( ( 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 enters a uniform magne m0 kj0qz,i; h9do)eqktic field whose direction is perpendicular to the particle90,qmdo0qj h k);izke ’s velocity. The particle will:

  98.10: A charged particle with constant velocity enters a unif: z gqu+e(v,f )5pfzuworm magnetic field whose direction is parallel to the particle’s velocity. The particl5zuqg fe w:)fu(p,v+ ze will

  03.34: A positively ch3tn w jy4nrd skc dcwx.)1h 02:j7cx*lh;vo3garged particle of mass 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 dixl r; : kdo sxjvw3w.2c*c43 ntgc10nj7)yhd hrected 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 velodx* 1 ( gz8;vajjwp0stcity in a region of space that has a uniform magn;dz8 w0 asjg1j(tpxv*etic field directed into the plane 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 negligible weight is relea ymdv9h/pq 9z+sed from rest between the pod hvzp+y/ q9m9les of a horseshoe magnet as shown. What would be the direction of the acceleration of the charge caused by the magnetic field?

  10.26: An electron movi 8/8inid/rj bfng in the plane of the page at an angle of 300 to the horizontal enters a regii/nbj8 ir 8f/don 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 resulting magnetic force on the electron?

  11.29: An electron moves with kuq)hynaa9 p -(kgv*: 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 csg+0 3iid) iyhharge −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 halfway around the circle. What is the amouish+y i d3i0g)nt of work done by the magnetic force on the electron in this time?

  97.28: An ion with charge q, mass m, and spc iw4 8/h ,1tggrpjj5eb9/ina wa*m ,ieed v enters a magnetic field B and is deflected into a path with a radius of curvature R. If a second ion has wier,b1/itjhp5/89wja * n g m,gca 4ispeed 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 magneti;9bzh4 sr*7fr: jgjhkc field B. A helium nucleus moves in a circular orbit in the same magnetic field. If each particle experiences the same magnitude magnetic force during its motion, rj97g j *shzk :;rb4hfwhat is the ratio of the speed of the helium to the speed of the proton?

  10.43: Two ions travel perpendicular tn9gmr*v i(zu c4p 98lto 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 the same for the m9vplu(8n9c gzi* t4r two ions?

  02.15: A positively charged particle ( 8/ucreccwlq9 ghxr j8c 5j;/moves to the right. It enters a region of space in which there is 8qcr ( je9wr8l5ugj c ;/h/xccan 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 ad;pw-ar 32ovh nd 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 chargel)1h ihv l*;b w94xzkpd beta particles is commonly determined bbv1 *)9lp4hlwz ihx;k y

  09.27: A proton moves straigj88 o6f1docd kt r -psyl.a+p)ht up the plane of this page into a region that has a magnetic field directed to the right. If the particle is undeflected aslr.t)pa8fd1 s6coo-jk+y d p8 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 two regions of space azob vr8z 5l,ncm39zg *long 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). 8, *m9zbg3nl c orzv5zThere 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 through a region o9mpew (v.lr 9qpq psbb-. 3m9nf space containing boweln.-p9 vqbrs99q mm3.p(p bth 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 cons)hs: k(ysfhp 3,0pnvy tant 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 electric field that exist at the location of the electronn(h,v0 kypp)s h:f ys3? Any electric field in the region originates from an unseen external source.