05.20: A portable radio that is playing is placed inside a screen cage as t i(uomm -- any:tx3x9shown. When inside the cage the radio sto x-ut-m9(3xmo ia ynt:ps playing because

  94.21: Which of the f((l bxf(3;8an 2rgpucsvc8bwollowing statements about solid conductors in electrostaticlw 8(bfbnrx8cc u(v 3sg2ap ;(s 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 positivnunmn z/5-fom-t:vvwqwv k ;. xo,.9ce charge + Q. Which graph best depicts the electric potential as a function of r, the distance from the center of th./w5mz.u ;nom ovvnkn-vw:x, f9 - qcte sphere?

  96.36: An isolated conducting sphere v/,p1 +l,5epgx/ew ,)e1,yoe r-o dc otjypif of radius R has positive charge + Q. Which graph best de1 ,fp/v-oicp)ey /ex5eprj e1o, tyg +d,lwo, picts the electric field as a function of r, the distance from the center of the sphere?

  96.21: Two isolated conducting spheres (S1 of radius 0.030(y98;q( bn olh tqvh.i-7 bwr;5su spi m and initial charge + 6.0 nC and S2 of radius 0.040 m and initial charge 89.(vsqblb-ohrnpisw7i ;y hu( qt5 ;+ 2.0 nC) are connected by a conducting wire. Charge will flow in the wire until:

  17.46 Two copper spher/u+ mtp bl1t4les 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 points 4 andu4lkkn t a90ezc4d f/8 6 on the positive x axis. Which of the following graphsucnl0 a 4e9t dzk4/fk8 best represent the electrical potential along the axis?

  03.50: A solid uncharged conducting sphere has radius 3a contakrx,9 0prd0*3.1zvgxjf ufkvins 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 = 4a from the center rj3r v09*xdpkg,.xfvfku z 10of the spheres as marked in the figure by P?

  11.46: A hollow conducting sphere in static equilibrium p up ymjz dnh7jkx4b,8ox-26( is isolated in deep space with a net excess charge +Q on it. What is the electric potential (assuming V(2x(7 zkn8 4bjdmppy6jo,h x- ur → ∞) = 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 hollow;ihgw tyxdo(zu;rdq126)( az9c lzz 6ed spherical region of radius a. A point charge +Q is placed at the common center of the spheres. Taking V = 0 as r → ∞ , the potential at2 zz9yu )1 zqlcg;(i ;wtozrd(dxh 66a position r =2 a from the center of the spheres is:

  04.50: A solid spheri.i i.3dpjg7i1ur b*bn cal conducting shell has inner radius a and outer 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 pdbb7.i3 g ir*1jiun .the charge density on the inner and outer surfaces of the shell to be exactly equal?

  05.45: A spherical congiiig4s49mkson6llg8)e 62 q ducting shell has 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 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 i4g )nlkm64lqg isg9 s6e28 oigoes to infinity, V = 0.

  07.42: A solid spherical condubx (cn+sy2ay0 ri sk*,-0w jffctor has charge +Q and 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 sp 0ajcrwf*- sb(ysn f2y, k+x0iace 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 space. The outer sa4nefl1 v1y d1)eyf.z hell has inner radius 2a and outer radius 3a. The inner shell haey1fdlf .1v1 nzyae4 )s 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:n ;i:v*onzu/ u,ij5 2xiqod bifk)u,9snt v, presented below that attempt to describe physical phenomena. Which on2:s5 *i bioi,z kqvd /,9uj:ou),vx;nftin nue of the following statements is correct?