05.20: A portable radio that is play uii7/o7ac8 esing is placed inside a screen cage as shown. When inside the c/i7iau so ce78age the radio stops playing because

  94.21: Which of the following statements about solid cond s-0zuoa:0 j/ dg/pcuouctors in electrostatics are trup/u 0:gao0dz cjo-us/e?
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 + Q. utaab+f19h, )j drw l4 Which graph best depicts the electric potential as a function of r, the distance from the center of the s)rwb1l af,u4d a +jht9phere?

  96.36: An isolated conducting sphere of radius R has positive charge + Q.l ez(qp/jbqtnr- x1+8gk)/ texd9kk0 Which graph best depiek/jnq/8(+0xqkx-g ebl tz)1dtpr9 kcts the electric field as a function of r, the distance from the center of the sphere?

  96.21: Two isolated conducting sphe vy.xiw 8xt;r-res (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) yxx8-.;rw vitare connected by a conducting wire. Charge will flow in the wire until:

  17.46 Two copper sphi s) dgvsm2xh6n+v 9i tgs,2k6eres 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 idw 4fn-tz2oa8e entical positive charges located at points 4 and 6 on the post8a4onze2w - fitive 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 co) ew2c2jk . re/ol lgzkv9djj* w*lg2b6(xpz.ntains a hollowed spherl6lbjek)z x 2e .zj.r(* */2gg ovd9w k2wpjlcical 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 of the spheres as marked in the figure by P?

  11.46: A hollow conducting sphere i gy, uy1cc.qo1afqv v2l.z )0fenm2u:n static equilibrium is isolated in deep space with a net excess c 2y.cqovye :ffu)1 lz0gu.,naq2cvm 1harge +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 $60^{\circ}$with respect to the +x-axis.

  02.49: A solid, uncharged conducting sphere of radius 3a contains a hollo veb97 oy*pg6rtvr8 a3wed 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 at position r =2 a from the center of rbte3*v9g rp8avo7y 6the spheres is:

  04.50: A solid spherical conducting shell has qbj)8 9tuljjlj3v ;x) 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 vl b 3 l8xj;t)juq9)jjorder 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 w;t:2a-kf o 0ju;r njznet charge +Q placed on it. Which of the following is the correct relationshiz;0u-k;w jn2:rfatjo p 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 goes to infinity, V = 0.

  07.42: A solid spherical conductor has charge +Q and radius Rw q ;hh9lgy7)x:sg6 do. It is surrounded by a solid spherical shell with charge − Q,hwg7 gx l;qo:96d hs)y 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 sphere.

  15.48: Two concentric0 mqtoavj 6(pyk/: kaht*qgi. xl0j.; charged conducting shells are in free space. The outer shell has inner radius 2a and outer radius 3a. The00mt(taigaqyk: j j.q k*;.hp6 xvo/ l 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 presented below that attempt to desc zcxp 8n:zw6 so3fk(+dribe physical phenomena. Which one of the following statements is corsp3k8f c6 odnz( +xwz:rect?