05.20: A portable radio that . q+yl;wcgs /4x3n(jt2mxpke is playing is placed inside a screen cage as shown. When inside the cage thc lsw ;2pnx4q3xet(k+ ygj/ m.e radio stops playing because

  94.21: Which of the following statements about solid conduc-4q7qm//x lg3 ecw zzby8zjo0tors in electrostatics x-ywlzmcej/ z3zo8g7 bq4q /0are 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 positive charge + Q.bjal c *c) x/cq,9oog0 Which graph best depicts the electric potent c09,g/ caj)o*qxoclbial as a function of r, the distance from the center of the sphere?

  96.36: An isolated conducting sphere of radius R has positive charge + Q. Whics1-+zj pa0v u )sarc69z;qfnb3el;dj1x h *zvh graph best depicts the electric field as a function of r, the distance -zl v9a ju+1xpvb nc*d6es3;0f;qs1hz r)jza from the center of the sphere?

  96.21: Two isolated conducting spheres (w2 hp:kcj;hzh( 60rd7vf v6odh3wy, cS1 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. Chargefhwhokcv c (wh3vrdy7 0dh,;j2 p6z6: will flow in the wire until:

  17.46 Two copper spheres X and Y, with different radk+5srx2u9m y r1csy *k p+ij3smeg(/tii ($R_x>R_y$) 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 showxtlymen9: -n .lap *u*s two identical positive charges located at points 4 and 6 on the positive x axis. Which of the following graphs best represent the elecea:xnyu-pn.l**l9 tm trical potential along the axis?

  03.50: A solid uncharged conducting sphere has radius 3a9wgtjhnqs ;( , jslq:: 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 = 4a from the center of:h:qjs(9s tln ,jq wg; the spheres as marked in the figure by P?

  11.46: A hollow conducting sphere in st)rk s2aw 0 lix,( p5ct:mdo0lac9r:wtatic equilibrium is isolated in deep space with a net excess charge +Q on it. What is the electric potential0(i0:aap rxwt5otc)lslc:rk ,9mw2d (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 ra 6e3ctaw3.2qinyypu0( bqe 6(opc wt) dius 3a contains a hollowed spherical region of radius a. A point charge +Q is placed at the comcnwteqp.( q )e32b tu3yiya w6cpo(06mon 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 spherix oc0)0lsf(vu3kd v mp,b//z vcal 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 d (vsz f,3 loc0mvb/uk)0p/xv the charge density on the inner and outer surfaces of the shell to be exactly equal?

  05.45: A spherical conducting shell has a nn; s8tzwu5)sjet charge +Q placed on it. Which of the following is the correct relation 8wsjn5zu;s)tship 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 R. I+8b0h+i1q poz zdni.wt 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 the inner sphere, Point B is located atr= R + δ, Point D islocated atr 0 db hz8+zon. i+q1piw=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 shel(ej1 x4)rsj uqga4y4 hls are in free space. The outer shell has inner radius 2a and outer radius 3a. The inner shell has radius a. It is known thh4x) rua y (sej14qgj4at 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 presentei wnl5-ii sc7a)bi9d9d below that attempt to describe physical phenomena. Which one of the following statements is correc9n di 7i5)bics9a-wilt?