05.20: A portable radio that isp5tes;j,* w zsn6s :go playing is placed inside a screen cage as shown. When inside the cage the ra,s5enj;s*pzs: towg 6dio stops playing because

  94.21: Which of the following+rk h.yf(l7h nie h)v,ghr(y( statements about solid conductors in electrostatic ,i(+7er hf h.)((vlrnghk yhys 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 positiv 6d:(sqsm; u2ofj;lqp e charge + Q. Which graph best depicts the electric potential as a function of r, the dists plsqfjo qdm;(;62u: ance from the center of the sphere?

  96.36: An isolated conducting sphere oftfxy,oq +* 3avn* 2wwn: r5alc radius R has positive charge + Q. Which graph best no 35v*a,w:ay*xfq2+cntl wr depicts 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. 8*jteg dxkfm6p7 0/la6uv3ta kjn e05030 m and initial charge + 6.0 nC and S2 of radius 0.040 m and ip07na3tt6d g0ujk/* av8k6xl jf5eemnitial charge + 2.0 nC) are connected by a conducting wire. Charge will flow in the wire until:

  17.46 Two copper spheres X andxf i;ip9x )h. yi70,pkfpr*ih 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 posi emd35d5 2caym f3i8pntive charges located at points 4 and 6 on the dm5 53d c28yaneifm3p positive x axis. Which of the following graphs best represent the electrical potential along the axis?

  03.50: A solid uncharged conduct2n0zv eipct8/dgi:h v )s1si 4ing 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 ens dp:1i0 cs/z84)ihg vit2vis 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 4d-4ks oafn) yr)v pg,hg a,a2 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 positi 4 nd a)2,)vo4kpg,-ayrgafhson 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 of0m 9kgl*qgxga x,t58a radius 3a contains a hollowed spherical region of radius a. A point charge +Q is placed at the common center x ,9t5*qxmg8gkag 0 al 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 radiu mbj21:wxkbz xa u5zd0tjp/r+q::qw- s 2a. At the center of the shell is located a point cz-:ra /51 2jd 0 ux:btw+mb kxq:wzqpjharge +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 exactly equal?

  05.45: A spherical conducting shell has a net charge +Q p vvjkqx1a z6hdttht+*. h-.-glaced 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, aatzt -*dgk 1j..-q th+v hv6xh 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 0pwn08 s7* t,mesysi dradius 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 s8t0n0ip *dm7s, wess ypace 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 i4 y oud/nzaqo8sp2b*1 76i3p-ow2 f l a8ekyospace. The outer shell has inner radius 2a and outer radius 3a. The inner shell h8deqw*a3u8oyno-z b o2y7p6lo2ki41fs ip/ a as 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 presented below that attempt to des+v;owzbu: lk)ud 01fccribe physical phenomena. Which one of the followu f:bk0cow v)dzu +;l1ing statements is correct?