09.18: A wire has a conventional current I directed tonto7w hfek26 pg )fyg 1 5l+oft4:i-pq the right. At the instant shown in the figure, an electron has a velocity directed to the left. The magnetic fo p4h)t pg q6k2e75+nf-y: ofifo1wtlgrce on the electron at this instant is

  14.24: For the bar magnet sho:1e2(we5l nlzd sp)hgwn in the figure, which choice best describes the direction of the magnetic field at the point P located directlye(gnld2) p :z1lhe5sw above the center of the magnet?

  11.34: A wire lies in the plane ofz*bbu0y,+p/kz zfscauags)7v 3 k)4wxap :,l the page with conventional current I shown. At the instant shown, what is the direction of the magnetic force on:7/u4y* wx )bupszk 0sfz +pv,l),aaazcb3gk 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 protonl3df pbv39j4 k moving toward the top of tdkfbpv4 93 l3jhe 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 4td6,fb 1mknm upward direction 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 direct1dk mfn mtb4,6ly toward it, the force on the proton is:

  95.16: A charged particle with constcr4.grqkzuuizj3 6 5 +y m+dn9ant speed enters a uniform magnetic field whose direction is perp6k3dn i4zuz. 9gu rc5+y qjmr+endicular to the particle’s velocity. The particle will:

  98.10: A charged particle with constant velocity enters a uniforzk3w,of,ec4 bkemod 4m3 1-w bm magnetic field whosk 1w4z3ekdb,,moome w4c-3f be direction is parallel to the particle’s velocity. The particle will

  03.34: A positively charged particle of mass M is at rescsq+hx1by6 cn9s k 6g+t on a table. A non- zero electric field E is directed into the plane of the table. A non-zero magnetic field B is directed out of the plane of the tabl6qsx 1hsy6b+9 ngkc+c e. 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 velociwqt)*.udd9cg0 a1 eljt97l qtty 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 9twqc 0* )jdateg . t91ql7uldis the direction of the electric field in this region of space? Ignore gravity

  04.14: A positive electric charge of negligible weight is releasej( p;m3a1l fsze7mig n-w.+ ra-ym6 b1cla;hgd from rest between the poll wa67n+ ;m1j .mb-aipm ;es(c- h1gla3gy zrfes 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 moving in the pl87q d(qno+,l(lozfe* vpr,uy ane of the page at an angle of 300 to the horizontal enters a region withpeqvz u8old y7nfr,l( ,(+qo* 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 speel 2ya1hrfl( (-b 1wey9dgqh0ed $1.00× 10^3\: m/s$ 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 wit 8 v h-9dx5htnu;gy(vph charge −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 circlevpdhy8n5t9-h(v; ux g. What is the amount of work done by the magnetic force on the electron in this time?

  97.28: An ion with charge q, masw6bi13,f w+gqogh3tz1myy0hs m, and speed v enters a magnetic field B and is deflected b,3yy6 z 3q+w h0hfgig 1mtow1into 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 heliu0 2e9ensm u0qp a9m32iwuiss8 m nucleus moves in a circular orbit nwaum0 9ise2se3 q08 msupi2 9in 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 perpen 5:*8a,5fpgn.j8d4bdnjv 1kav y t ijudicular 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 for the two ionsn* .t,a1j fdkvjyv 5 5:84n8uaij pgdb?

  02.15: A positively charged particle mi u9zgwca+z: +oves 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 velocityu z+:cag9+wzi?

  96.40: A proton of mass M and kin u gzt.efgh10x 7*hdp8 +qmn9vetic 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 commonlyphni w. (,:4fvtu6evd determined bydvi hw.(nu 6, fv:et4p

  09.27: A proton moves straight up the plane .:jwe 4pbo ops;e+0urj p.5rn, sb5vsof this page into a region that has a magnetic field directed to the righjs5;u0 wsv p.5pb. jsreo b4nr:,e p+ot. 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 m27y4 fuths)nt+ v3x hroves in the plane of the page through two regions of space ahxhr+ 3ty)sn2 fuv7 t4long 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). 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 through- ;e6dqjw cfq8 a region of space contaie8 q6fcw; dq-jning 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 ote/q h 0c5;prbetween 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 cot;/qh 0 er5pexist at the location of the electron? Any electric field in the region originates from an unseen external source.