05.20: A portable radio that +ouwb(v -7lec8ln9d eis playing is placed inside a screen cage as shown. When insv ln(b9uo8+-ce wed7l ide the cage the radio stops playing because

  94.21: Which of the following statements about solid co zk9jnh fw0mj zdr5-j1,jd7 u1nductors in electrostatics znjd jh,rj1zw9df1 u7 0jk 5m-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 positive ca+ b/ yxve5 es8m)8ntzharge + Q. Which graph best depicts the electric5mbea8t+z8 n esxy)v/ potential as a function of r, the distance from the center of the sphere?

  96.36: An isolated conducting sphere of radius R has pobtlt( nou33 7s61wslm kq.5us sitive charge + Q. Which graph 3s sso671qb n(ul .t3twl5umkbest 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 0.030 m and initiati8cut(aa)3hk;8vln i *xg, ol charge + 6.0 nC and S2 of radius 0.040 m and inivtn3 t;ok8ai*icg a, (l) hxu8tial charge + 2.0 nC) are connected by a conducting wire. Charge will flow in the wire until:

  17.46 Two copper spheres X and Y, with :rkvp4f r)m+n 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 ijdel,6qpe67d vvw;8oou :yo-5 rzqr( dentical positive charges located at points 4 and 6 on t rev(d poe65y8 qwdr: zoq;6 ,ol-uj7vhe positive x axis. Which of the following graphs best represent the electrical potential along the axis?

  03.50: A solid uncharged conducting sphermwt9 9,yf srb2e has radius 3a contains a hollowed spherical regiwystr 9 9,m2fbon 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 in static equili wms x,s)-wb;dbrium 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 labeled P shown in the interior of the figure? The sphere hasxd ws-s)wm;,b 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 conduct2v+4m4f7p eur, 6 yqrptpd+ fking sphere of radius 3a contains a hollowed spherical region of radius a. A point charge +Q is placed at the common center of the +7e6p2+pktu q vrfpm4rf d,4yspheres. Taking V = 0 as r → ∞ , the potential at position r =2 a from the center of the spheres is:

  04.50: A solid sphericalqeshzi :-l37x lp3 x2;3 ntnfn 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 the charge density on the inner and outer surfaces of the shell to be exactly equal?2p x7q xhti-;:3sn 3fn3 lznel

  05.45: A spherical conducting shell has a net charge +Q placed on+r 4sp6qa v1gu 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 distance6sr1a4 ugpvq+ R from point B outside the sphere. As r goes to infinity, V = 0.

  07.42: A solid spherical conductor has charge +Q and radiuersw8ajd6 f+1 vi:qo*s 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 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: 1*+sw8if6 eaojv dqr =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 cxfsjka. ;u w8t:t pl-;harged conducting shells are in free space. The outer shell has inner radius 2a and outer radius 3a. The inner shell has radius a. It is kno:kx.;f tj8- ts;pawlu wn 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 describe phypho1 z: meyw5-sical phenomena. Which one oy:p1wo5-hme z f the following statements is correct?