09.18: A wire has a conventional 5vp k 9 x)qn+tgecx-k4current I directed to the right. At the instant shown in the figure, an electron has a velocity directed to the le-kpgncxx9 5k 4vtq+e )ft. The magnetic force on the electron at this instant is

  14.24: For the bar magnet shown in the figure, which choice best descrw ha c c.83*vibfp0d2sn8b l3pibes the direction of the magnetic field at the point P located directly above the center of the magnetbishn8 cvp2 3*.w8f0lp3dca b?

  11.34: A wire lies in the plane of the page with conventio:9 uvs ea.y3z -ean ek;ewge83-b0xa onal current I shown. At the instant shown, what iesv0b zn8w-ee. 3 xaygaek9a-e3uo;: s 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 wire as shown. For the 72qmy6ins/b( r3 ojei proton moving toward the top of the page at the instanib7qr y6mi/ os2n3e j(t shown, what is the direction of the magnetic force on the proton?

  94.30: The conventional current I in a long straq0up anv(l ;4h+d lr4tight wire flows in the upward directio 4( +;40nraduvlplhtq n as 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 speed enters a un/4gpy v.d/v oz unos6;iform magnetic field whose direction is perpendicular to tuzpd gv no4o.;//v s6yhe particle’s velocity. The particle will:

  98.10: A charged particle with constant velociq+vr1s ame36pty enters a uniform magnetic field whose direction is s1 +rpmeq3a6v parallel to the particle’s velocity. The particle will

  03.34: A positively charged particle of mass M is at rest on a taw4n w:kt yuzb 71gy0f+oq)3d4 *akn zqble. A non- zero electric field E is directed into the plane 1*+wo 7f0zauntqbkqznd43:yk4g ) ywof 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 q2vtzcn ,1-cy k4prx p)0f p6 e/wyw+iwith constant 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 the plane of the page. What is the direction of the electric fk f/pr )wc4y+ zyw,0-eiv6 2xpcnt1qpield in this region of space? Ignore gravity

  04.14: A positive electric charge of negligible weight is released from rest betqpgu5d qoo9 ,6my)6,fdskkw:* l0ewx ween the poles of a horseshoe magnet as shown. What would be the direction of the accgw)k,66qp 09* l5d qxfwd smo:ek,yu oeleration of the charge caused by the magnetic field?

  10.26: An electron moving in the plane of the page at an angle of 300 to the h :smsgkblawkc l62fa/)/y/g *orizontal 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 thg2f*k l/gs6alwkbm/s c )/: aye resulting magnetic force on the electron?

  11.29: An electron moves witk,+z3 fow6f grh 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*sn2 r li70hl0g f;hio m travels at a speed v in a plane perpendicular to a magnetic field *flgho0ihs r 2;n07ilof 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 force on the electron in this time?

  97.28: An ion with charge q, mass m, fseb /:vecw8,p4p./w p+ gpky 4c-wyiand speed v enters a magnetic field B and iyy. 8wc, +4pbeefspp:pv/- k wcg4wi/s 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 circular97w1te2o myde orbit in a uniform magnetic field B. A helium nucleus moves in a circular orbit in the same magnetic field. If each particle experiences the same magnitude magn y7w2med9oe1 tetic 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 perpendicular to the same uniform magnetic fcao9 nx(+ u h)7iwomb/ield. The ions carry the same charge and have the same path radius in the+)mha9x(b oonc w7 i/u magnetic field. Which of the following quantities must be the same for the two ions?

  02.15: A positively charge g 8fitzsf/,g.u5yf g c4l(:yod particle moves to the right. It enters a region of space in which there is an electric fielzfo5 c. 4fliyug:(/sgy,f8t g d 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 anf)giw- cfa+q 5xa+n6na y5bx,d 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 determine7ffl r,fafk v.hj5 4s*d by lah k7,frj4f5s.vff*

  09.27: A proton moves straight up the p oqvhyh 2tyk,s48-)melane of this page into a region that has a m-tys, )8qh4okvyeh 2 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? Ignore gravity.

  08.36: An electron moves in the plane;g +zsynirnte 1p4n+1 of the page through two regions of space along the dotted-line trajectory shown in the figure. There is a uniform electric field in Region I directeg+4z+1 nnyeti 1rpn s;d 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 constant velocity throughbf3 s i.27ly3mtla3fp a region of space con7fs.fm li pl33a32 ytbtaining 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 velociwwulbd epq)b.631hf3 ty directly between two long straight wires. The conventional current in each wire has the w.bw3f3 6lphuq 1dbe) 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 electron? Any electric field in the region originates from an unseen external source.