09.18: A wire has a conventional current I directed to the right. At the5a2 e anmi-h-cyx/8l;jwn*x y instant shown in the figure, an electron has a velocity directed to the left. The magnetic force on the electron nnwc 2y8xj/x-ia -*l5ehm y;a at this instant is

  14.24: For the bar magnet shown in the figure, which choice best describes the d*jea- ai2vvh0e leo) 9irection of the magnetic field at the point P0*a ajeo- 2 vieevl)h9 located directly above the center of the magnet?

  11.34: A wire lies in the plane of the page with co2: a4do wyg3yjnventional current I shown. At the instant shown, what is the direction of the magneo3: dwja42ygytic 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*nx/ad 4i3ae*jii *yv shown. For the proton moving toward the top of the page at the instant shown, what is the d /ij ie4y*x**ian3 avdirection of the magnetic force on the proton?

  94.30: The conventional current I in a long q73eal l bs 3+pvkp1u8t,pdy5straight wire flows in the 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 directly toward it, the force on l+ y3u d lp7a se51qtk8pbp3,vthe proton is:

  95.16: A charged particleaxz c-c :2,z-h*thuxm with constant speed enters a uniform magnetic field whose direction is perpendicula, a- xz -xmctu:*h2zhcr to the particle’s velocity. The particle will:

  98.10: A charged particle with constant velocity enters a uniform magneticemb)z6 p.e i,ycegr u71y*x*g field whose direction is paray i71r6 ec*yg. e,gp) *zebxmullel to the particle’s velocity. The particle will

  03.34: A positively charged particle of mass M is at res6h cq4s;l;+ rz ,p80bw1o dc fzohuc:wt 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 table. What is true about the magnitude of the electric force on the wp c6q;0 :u; hw8r, zc4+ols1ozhfbcd particle $F_E$ compared to the magneti force on the particle $F_B$?

  16.24: A proton moves wit:mt9r f;yztq syqlwrps/,0 * (h constant non-zero velocity in a region of space that has a uniform magnetic field directed into the plane of the pag:str tzq/pfl s9y*;w(my r,q0 e. 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 re ,ynndqc;yt31cp46mei( fc7 9e k j-ouleased from rest between the poles of a horseshoyjt c91qm3nfyid;c-e,6uce7 (k 4 pone magnet as shown. What would be the direction of the acceleration of the charge caused by the magnetic field?

  10.26: An electron movinzt imon d(vq/7;xl 8-uouza +3g in the plane of the 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 mamu o;tu- qx /ind73ozv(z+8 algnetic field, which best describes the direction of the resulting magnetic force on the electron?

  11.29: An electron mkg,eq u0 p0ot3oves 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 −e and mass m travels at +yqvs2u.7:bomjscxf-*1 lsx 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 by the magnetic force on the electron in this timeu sx.7q* bmf2+cj1o sly x:s-v?

  97.28: An ion with charge q, mass m, and speed v enters a magneti2l*k nnob ;l2fc field B and is deflected into a path with a radius of curvature R. If a second ion has speed 2v, while m, q, and Bf n l*;onb2l2k are unchanged, what will be the radius of the second ion’s path?

  16.44: A proton moves in a circular orb+u0mnys ; nvd8g *8wqeit in a uniform magnetic field B. A helium nucleus moves in a circular orbit in the same magnetic field. Iv +8 mgsd8u;n*ew nyq0f 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 perpendicular to the same unig 3ot 2 4xw5.. dv+gcy2chxgqzform magnetic field. The ions carry the same charge and have the same path radius in the 3+vydzw.hc x x .t4 co52g2ggqmagnetic field. Which of the following quantities must be the same for the two ions?

  02.15: A positively charged particle moves t0wr:o(bq hs-d ue ;9846 7cof k:xmglion jv*fo 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 velocity? uefm0 q8lwo(js*dk:xg9o4ci-r;oh 67 n vb: f

  96.40: A proton of mass M and kinetic energy l;e ua921f)nwxv.usm $E_k$ 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 betamj)wtuwx2 nkpocp, x15scnw1 a 34l/6 particles is commonly determined b2 cx)1l/tnws53cojax nw uppk 64,1mwy

  09.27: A proton moves straight up the plane of this page into a region of+ :m:/f r qv2odslw.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 component of electric field? Ignorf:r/:+2wvm.o of qs lde gravity.

  08.36: An electron moves in the plane of the page through two regions uo.u .w.qbf; xof 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 page (as shown). There is no electric field in Region II. ..fwx;q .uou bWhat is a necessary direction of the magnetic field in regions I and II?
Ignore gravitational forces.

  12.36: A positive chaf;kwr8/i *)iw kdir+x7 krzk(rge moves with constant velocity through a region of space containing both an f 8 rix(kzw*i/krrk)7;+ iwdk
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 veloc/ ynh+m v6ma 3one*taz:2s9p eity 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 figur s /:zaeo3*n62mpa+myhtnve9e. 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.