05.20: A portable radio that is playin)(m4nymfw* 1fm i 8egpg is placed inside a screen cage as shown. When inside thenwi)(84f m fy* p1emgm cage the radio stops playing because

  94.21: Which of the following statements about solid condu3ats goz4+34yoa q s9yctors in electrostatics are ts +ay9sy334g to ao4zqrue?
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 + Q7d2 pgt4g/fjt.h gvo3a+ xz88vags 1w. Which graph best depicts vva3 p tw8hg4zj87g2oxfa/t g.+sdg1 the electric potential as a function of r, the distance from the center of the sphere?

  96.36: An isolated conducting sphere of radius R has positivetnr2p fp4v8y . charge + Q. Which graph be4 vrp2.8tnfyp st depicts the electric field as a function of r, the distance from the center of the sphere?

  96.21: Two isolated condugvxjuo 1h5qe5wo)9ms oh+, e0 cting spheres (S1 of radius 0.030 m and initial charge + 6.0 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 wirm o hoegjvhs15u0q+5x, )eo9we until:

  17.46 Two copper sphekl md(jd0,ct.or x.4kjkf(66 iagcm*res X and 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 positive charges located at poinghz09,93zo6fxuaxmt * m8 obu ts 4 and 6 on the positive x axis. Which of the following graphs best represent the electrical potent 6hxb9a 3xzmo tfu*0gmozu,8 9ial along the axis?

  03.50: A solid uncharged conducting/ sc.wq8+cp7mn( d rhx sphere has radius 3a contains 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 electric field at the position r =ps+wdc cqx7hr8 mn/ .( 4a from the center of the spheres as marked in the figure by P?

  11.46: A hollow conducting4kg85x rf sye) sphere in static equilibrium is isolated in deep space with a net excess charge +Q on it. What is the electric potential 8gyr4 f xsk5)e(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 spherew-e;.9o( za eplk,xjm0 t)ld+zgh1 s e of radius 3a contains a hollowed spherical region of radius a. A point charge +Q is placed at the common center of the spheres. Taking g ew0ze ,1 al.hdm(xo p+)9tk-jlz;se 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 o-uys,uq7 lbc 8:igta0uter radius 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 charg uqbgc a,yuls7t8:-0ie density on the inner and outer surfaces of the shell to be exactly equal?

  05.45: A spherical conducting shell hf66d chk,li( dk fp-6uas a net charge +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 centdckk-fi f 6h6(,d6lp uer 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 and radu7)7m +vyp;zyt7ylu mn/gm u .ius 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 thevuyuy7)unzg7;7 .m y/+t mml p 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 c6 n aiow idigd)f7:9)in free space. The outer shell has inner radius 2a and outer radius 3a. The inner shell has radius a. It is kn96idgf ic7 :)wioda) nown 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 prese;gzdax+avtjfbiy.h 96,ulnejv79 3u t 2 ,8 wknted below that attempt to describe physical phenomena. Which one of the b9z l 92 guy,dtwxe8.najvj t+k ivf 6,u;a7h3following statements is correct?