05.20: A portable radio that is ,ogb-bu*p 0 pvu +da,lplaying is placed inside a screen cage as shown. Wbp -,ld,avp u*bo+ug 0hen inside the cage the radio stops playing because

  94.21: Which of the following statements about solid conductors in electro );v)zqu u( wseaxj+5xstatics are t)x+j qu v5xwa) es(;zurue?
I. The electric field inside the conductor is always zero.
II. The electric potential inside the conductor is always zero.
III. Any net charge is on the surface.

  95.07: An isolated conducting sphere of radius R has positive charge + + n/orh 8kq*kp.cmiz 6Q. Which graph best depicts the elec+6q* /p n k.hrciz8omktric potential as a function of r, the distance from the center of the sphere?

  96.36: An isolated conducting sphere of radius R has positive charb lkb *bt44k+,ef3mm5f9hj lnuaa5 5zge + Q. Which graph best depicts the electric field as a function of r, the dist m59*klkbe53b+h,nau4mf tfabz5 4 l jance from the center of the sphere?

  96.21: Two isolated conducting spheres (S1 of radius 0.030 m and1nz ys a;fm;(a initial charge + (ns;1fz a; yma6.0 nC and S2 of radius 0.040 m and initial charge + 2.0 nC) are connected by a conducting wire. Charge will flow in the wire until:

  17.46 Two copper spheres X and Y, with different radii (frxu:rp9ali )-esyo1 3lx k0.sz / :ku$R_x>R_y$) and equal excess charge +Q, are placed apart from each other. A scientist using insulating gloves connects the spheres with a copper wire. Which one of the following choices best describes what happens after the connection is made?

  03.43: The diagram shows two identical posite( g3 h6rqqb)o lrup.1ive charges located at points 4 and 6 on the positive x axis. Which of the following graphs best represent the electrical potential along the ax bo)h( 6e3glqr1.urpq is?

  03.50: A solid uncharged conducting sphere has radius 3a i4 j3k/su nvg 08okln+contains a hollowed spherical region of radius 2a. A point charge +Q is placed at a position a distance a from tjnkov8 /3k4usi ng +0lhe common center of the spheres. What is the magnitude of the electric field at the position r = 4a from the center of the spheres as marked in the figure by P?

  11.46: A hollow conduz8oqui1:9ja48h)pnw8nke o ecting sphere in static equilibrium is isolated in deep space with a net excess charge +Q on it. What is the ej91kew a8ohz pnu8n8 :) e4qoilectric potential (assuming V(r → ∞) = 0 ) at the position labeled P shown in the interior of the figure? The sphere has radius R=3a and the point of interest is at a location r=2a from the center of the sphere at an angle of $60^{\circ}$with respect to the +x-axis.

  02.49: A solid, uncharged conducting sphere of radius 3a contains a iy:orx8f9. :lj9ftblo(o :ic hollowed spherical region of radius a. A point charge +Q is placed at the common center of the spheres. Taking V = 0 as r → li::oc:. 9of j ti9( obyl8rfx∞ , the potential at position r =2 a from the center of the spheres is:

  04.50: A solid spherical 1rdgo8.p)or+jss r g6conducting shell has inner radius a and outer radius 2a. At the center of the shell is located a point charge +Q. What j+od)s .1rs gp8 r6rogmust the excess charge of the shell be in order for the charge density on the inner and outer surfaces of the shell to be exactly equal?

  05.45: A spherical conducting shell has a net charge re ou87l8 w8yx+Q placed on it. Which of the following is the correct relationship for the electric potential at the points labeled A, B, and C? Point A is at the center of the sphere, point B is at the surface of the shell, a distance R from point A, and point C is a distance R from point B outside the sphere. As uyer7w88lo8 xr goes to infinity, V = 0.

  07.42: A solid spherical conductor has 7eh7niy,a z- s5b zeso/ 32qyxcharge +Q and radius R. It is surrounded by a solid spherical shell with charge − Q, inner radius 2R, and outer radiusaxeo/5-qzhyzybn7, 3eis 2s 7 3R. Which of the following statements is true for the labeled points in the diagram? Assume these objects are isolated in space and that the electric potential is zero as the distance from the spheres approaches infinity. Point A is at the center of the inner sphere, Point B is located atr= R + δ, Point D islocated atr =3R+ δand Point C is located at r =2R − δwhere δ is an infinitesimal amount and all distances are from the center of the inner sphere.

  15.48: Two concentric charged conducting shells are in free spac eh4u18jb)ofg e. The outer shell has inner radius 2a and outer radius 3a. The inner shell has radius a. It isbgjf8ou)4 e1h known that the electric potential at $r=3a$ is $V_{3a}=\frac{kQ}{3a}$ . If the electric potential $V_a$ at $r=a$ is 0 volts, what is the charge on the inner spherical shell
$Q_in$?

  14.35: There are several statements presen3lbip b,q oa2n9)w59eil yr/hted below that attempt to describe physical phenomena. Which one of the following stai3l95ybeq9p o ) nh r/bl2awi,tements is correct?