05.20: A portable radio that is :.(:d9wuflmbd bx4 zhplaying is placed inside a screen cage as shown.b4:.d hdfm:b zuw(9xl When inside the cage the radio stops playing because

  94.21: Which of the following statements about solid conductors in electros68abm i(evtc ju7+il4ukc8 9dtatic e4a7 8cudlct6 k8u(b+i9mj ivs are true?
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 p) lidf0kqs5t gr +zp0/ositive charge + Q. Which graph best depicts ther gkpdzifs)l qt/05+ 0 electric potential as a function of r, the distance from the center of the sphere?

  96.36: An isolated conducting sphere of radiui fd)hi 0tb5i3j)+,85sasu puv iawl3 s R has positive charge + Q. Which graph best depicts the electric field as a function of r, the dh 5pwj,i i s35tis3bi)u8 )0v+ fadluaistance from the center of the sphere?

  96.21: Two isolated conducting spheres (S1 of radius 0.030 m and i,kvna tim1v8 (xr-ezxx. (j- pnitial charge + 6.0 nC and S2 of radius 0.040 m and initial charge + 2.0 nC) are connected by a cojev ,xx (-n1 x zria8-.kvtm(pnducting wire. Charge will flow in the wire until:

  17.46 Two copper spheres X and Y, wipuj)hui:g 8j+g;q7 b cth different radii ($R_x>R_y$) 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 s/- ar5 4 nrvkqrgwp:x-hows two identical positive charges located at points 4 and 6 on the positive x axis. Which of the following graphs best represent the electrical potk 5-vq/g4-xrpan :rwrential along the axis?

  03.50: A solid uncharged conducting sphere has radius 3a contai3 0jypnq 53:nz uuio0xns a hollowed spherical region of radius 2a. A point charge +Q is placed at a position a distance a from the common center of the spheres. What is the magnitude of the el3x35 yqnpi0j no0 z:uuectric field at the position r = 4a from the center of the spheres as marked in the figure by P?

  11.46: A hollow conducting sphere in u/5kku+hv4 e* uj8x 0t9 cxc nhf99ixw static equilibrium is isolated in deep space with a net excess charge +Q on it. What is the electric 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 locat /xt u 99kh4wcuhxcn9i*8u+5x 0fejkv ion 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 conduct.o/vbcs 4 j57npm m:r*adq4 ching sphere of radius 3a contains a hollowed spherical regionad*r 7n4: m.hc4bmsjqv 5cpo/ of radius a. A point charge +Q is placed at the common center of the spheres. Taking V = 0 as r → ∞ , the potential at position r =2 a from the center of the spheres is:

  04.50: A solid spherical conducting shell has inner radius a and outer r)s)u0hj t+zk7qa1 dzdn(tb3sadius 2a. At the center of the shell is located a point charge +Q. What must the excess charge of the shell be in order for the charge density on the inner and outer surfaces of the shell to be eq3h)+ )k tbd0zznsa (d7s uj1txactly equal?

  05.45: A spherical conducting shell has a net charge +Q placed on -t49nxe n kx:tm 9e2gnit. Which of the following is the correct relationship for the electric potentitm-xt2e9n e x:nk9gn4al 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 r goes to infinity, V = 0.

  07.42: A solid spherical conductor has charge +Q ac p7:.az 0nd,9e f e4upx2elbknd radius R. It is surrounded by a solid spherical shell with charge − Q, inner radius 2R, and outer radius 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 sphcxafpe0 u ,n2epk.b4e79 z:dl ere.

  15.48: Two concentric chargelkle 9 zq,av57*c( h .lwwqfl0 w(zuu;d conducting shells are in free space. The outer shell has inner radius 2a and outer radius 3a. Tau.hel , 7uq;l0fkz9(wwqzv(l lwc* 5 he inner shell has radius a. It is 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 presjv9e6e5-4aywt l 8dpj4 0 swexented below that attempt to describe physical phenomena. Which one of the following stat540yjwd s6le8 wp9je4 tvxae-ements is correct?