05.20: A portable radio that is playing is placed inside ;w1*oift4f cd a screen cage as shown. Wh;wc 41tfdfi o*en inside the cage the radio stops playing because

  94.21: Which of the following statements about solid conductors in eleidvr) f/n:30+iedq 6g2j;t-zygj biictrostatics are trud jdr6 jn q2)+g:f;b0ieviit3/z iyg- 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 of8mivqdg 4r-yb w+zj49-; duo v radius R has positive charge + Q. Which graph bouirwq m+4 9-v8b 4jdzgd-y;vest depicts 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 positive charxxkq n(*pbwz2e5 bkbo1(1l h0 ge + Q. Which graph best depicbbxwn1hk 52lb*okz1 exq(( 0p ts the electric field as a function of r, the distance from the center of the sphere?

  96.21: Two isolated conduoznxi, q ;astg6)u 6+mcting 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 wire unti;+,smi6o )tgxnqa u6zl:

  17.46 Two copper spheres X and 5:p e:u yu84.zg2u bj ccix.rwY, 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 poi;y0r9)1o51 yt ks4atuhb,ni v q)eambnts 4 and 6 on the positive x axis. Which of the following grapa m ate ibrbu05qvy; )s,1n91h)oy 4kths best represent the electrical potential along the axis?

  03.50: A solid uncharged conducting sphere has y 5bg,;cly5 rqradius 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 electricyq;lb55r , gyc 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 static equimi1/ 4/ljm 9bloj9xpflibrium is isolated in deep space with a net excess charge +Q on it. What is the electric potential (assuming V(r → ∞) = 0 ) at the position labelepmlo1l/ / jm bj9if94xd 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 cod j96 m;ew ,e3lz1ksy e56noz38 tbgfgnducting sphere 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 V = 0 as r → ∞ , the potential at position r =2 a from the centen3m6s zo ed 1gt 5ygfzwl6jb,;98e 3ker of the spheres is:

  04.50: A solid spherical conducting shell has inner radius a anwb9-qx l 97ryqc0wc 7 +hxy-+av,wlfiv1j vm) d 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 the charge density on the ih0 9 q9 +f7-7yy1 llvxjmwa )wwv-ci,+vqbcxrnner and outer surfaces of the shell to be exactly equal?

  05.45: A spherical condu3z4p e bdxj*,pb tm;/qcting 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 tdxm3/bp4zj*e,q b; pthe 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. Itw5z9:5y tlabwx*fyy yzezw+l+ 2o,+z 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, Poyxta fy zz+bzy+w+,5l y*:o e259zwlwint 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. ijj.yku4dq61 The outer shell has inner radius 2a and outer radius 3a. The inner shell has radius a. It is known that the eyu.djk64 j iq1lectric 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 describe phy; ir3q,qhlz 4,s yt5xcsical phes3,hr,lqi zty4;cq x5nomena. Which one of the following statements is correct?