05.20: A portable radio thaz oi*k3)y:4ot1 pnmx et is playing is placed inside a screen cage as shown. When inside the cage the radio st:)yoioptn4* 3kzxem1ops playing because

  94.21: Which of the following statements about sow)8e5.puef2,n ru;aj(5o okdzwdt9d lid conductors in electrostatics are tru r2 ten)aue(,k8jd;wpo od95f 5 wdu.ze?
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 radiu w4nt,7y 29rkn( xm8*z xmtxens R has positive charge + Q. Which graph best depicts the electric potential as a funct nrm(zttexx*8m, 2n47yw k x9nion of r, the distance from the center of the sphere?

  96.36: An isolated conducting sphere of radiu s,p9a)x.bthcsymk1x6u, u ( ps R has positive charge + Q. Which graph best depicts the electric field as a function of r, the distance from the center of the sphere?xup ), 1a s9ky.b,p( h6sxutmc

  96.21: Two isolated conducting spheres ( 6nd 0+6p xisiyo+u94h4o tk 4dzbq8hnS1 of radius 0.030 m and initial charge + 6.0 nC and S2 of radius 0.040 m no0q + 4dk8zs+66bxioy h4u9idnp4htand initial charge + 2.0 nC) are connected by a conducting wire. Charge will flow in the wire until:

  17.46 Two copper spheres X a +-gh +c j.xxlm tkj+,n8qdk(knd Y, with 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 shows two identical positivert o 0mpssup1; 2qql -ko(1b6 6e4rfin charges located at points 4 and 6 on the posikto si p(qe1pb;uqrr1 2s6fm4- 6n0lotive x axis. Which of the following graphs best represent the electrical potential along the axis?

  03.50: A solid uncharged conducting sphere has radius 3a contains a hollowed b8qcsgtj:63d spherical regiotgb:ds8j 6cq3n 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 electric 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 static equilibrium is iso+nccv g am-78slated 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 location r=2a from the center of the sphere at an angle of nsc+ -g8a7vcm$60^{\circ}$with respect to the +x-axis.

  02.49: A solid, uncharged conducting sphere of radius 3a cont d9hqvlv4z9u9p 7o /,zuonk*tains a hollowed spheriq9*hpl/ ,v9dzuzot7 9 vk4nuocal region 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 radiyki5 o :9xpzx-us 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 den 5zyk pxx-9io:sity on the inner and outer surfaces of the shell to be exactly equal?

  05.45: A spherical conducting shell has a net charge +Q placed on it. Which of upp x u7,j6kb1the 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 pu xpkjp67u,1 boint B outside the sphere. As r goes to infinity, V = 0.

  07.42: A solid spherical conductor has charge +Q and radius R. It 1a/e*qg,jey+q aw(y c 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 /+ *q eqy eag(cj1w,ayat 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 s /y** igxih7xkpace. The outer shell has inner radius 2a and outer radius 3a. The inner shell has radius a. It is known that thk xii*x*7yh /ge 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 ve9-ijey0 tsj.er 1tn6g qc4 lg;ck(8statements presented below that attempt to describe physi89qg4rs ;1ney6k0clj -cv.et(ijgte cal phenomena. Which one of the following statements is correct?