09.18: A wire has a conventional current I directed to the r+tphr2 0ahv ss 2(f(kov)kpows 8 5jx5ight. At the instant shown in the figure, an electron has a velocity directed to the left. The magnetic force on the el kvo5(vot)pfs02jw5 sprkxa2 h h8( s+ectron at this instant is

  14.24: For the bar magnet shown in the figuo (ds xgp:i l(d0g* b-7cjl z)ln0k3ckre, which choice best describes the direction of the magnetic field at the point P located directly0lckc (bklx7(sodd)0z3 -lp g :ng*ij above the center of the magnet?

  11.34: A wire lies in the plane .m j*pjh(qv +cof the page with conventional current I shown. At the instant shown, p*cmj.h(q +jvwhat is 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 proton movin5wjyys sq8v 54-u4 rwtg toward the top of the pag4 4vyw 8yrjq5sts-u5 we 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 upward di-9ir- c;:*pc *y stmm n3njc-gub(fgdrection 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 direfn(9 c*cnji :mg *-gd;y 3-ump r-stbcctly toward it, the force on the proton is:

  95.16: A charged particle with constant speed enters , y ms-)tt)kxea uniform magnetic field whose direction k )-,mtx)estyis perpendicular to the particle’s velocity. The particle will:

  98.10: A charged particle with constant velocity enters a uniform m4s rvf1hs ;6epagnetic field whose direction is parallel1v efh6r sps;4 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- g92t5x iytjc un08e:d9-gzd mzero electric field E is directed into the plane of the table. A non-zero magnetic field :gx2d0g8 n tc9i 5u yetz-d9jmB 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 region o wj mif6 )fk kwkf*0i-lculn*5(8yjq2f 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 fieldfl* kl 6jfnw8j- iky(q5k 0mf*c wi2u) in this region of space? Ignore gravity

  04.14: A positive electric cw jnjl xd1n 5+nl:4ye6harge of negligible weight is released from rest between the poles of a horseshoe magnet as shown. What would be the direction of the acceleration of the chay41nwj5nn 6l+xe:djl rge caused by the magnetic field?

  10.26: An electron moving in the plane of the page at an angle of 300 t d xz9foe5di7zu6cjr76ob2h9 o the horizontal enters a region with a constant magnetic field directed horizontally in the plane of the pagujb9ddfxo67 eo h5iz6c9r z72e 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 mo49qn rlf erq:9ves with 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 kw0bob.b12gpd -w- oq −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 halfwabwb0 op--2 ogdbw1.qky 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, and speed v enters a magnetic fiellm, a/zj itlf 0l1:,/n.zvm sid B and is deflected into a path with a radius of curvature R. If a second ion has speed 2v, while jin lma1 fllvi t zs,m//,.z0:m, q, and B are unchanged, what will be the radius of the second ion’s path?

  16.44: A proton moves in a g a zfiul +ysi5p9)b3(circular orbit in a uniform magnetic field B. A helium nucleus moves in au b+3 fii95 )(lsyzgap circular orbit in the same magnetic field. If each particle experiences the same magnitude 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 p u /7esl3*rrfqerpendicular 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 the same/*lru3f 7sre q for the two ions?

  02.15: A positively charged particleswa+m(jt f/6nl/:p tus .c6k e moves to the right. It enters a region of space in which 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 velocit /aj6.mp: l 6k t/(usft+ewsncy?

  96.40: A proton of mass M and kinetic)tocgf fhsg6 +ce9 una0 ,30qm 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 electrife5kvrq-np4i8 +9uqsf(mm u puuri,,)8nf 5c cally charged beta particles is commonly determined byiq4kc+se ,pm fiuu rnp( mvq8uf9ur5,) 5fn8-

  09.27: A proton moves straight up the plane of this page into a region4b9 wfci1w8u((hfl ;jmuo46xsz jk .y 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 componekwo4jl ;( c69.4 ifuxfbmz18j yush(wnt of electric field? Ignore gravity.

  08.36: An electron moves in the plane of the page thrshjo o 1px(sw l9 0,5xwkyl42tough 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 page0yoh4 stw(9lwpx2 k5,s jol1x (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 througz:nh7ikb5qu3+v3 1 icieo 9kgh a region of space containingh353 uo1+9v zi:k icb7 eqking 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 mo )+ttqgu5d -ncves 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 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 rt) +utcq5-dg negion originates from an unseen external source.