05.20: A portable radio that is playing is placed insid(ok;h9a--( qv.xf/rsuslj zie a screen cage as shown. When insids. xvqj9lo(izsa f (;--r/hkue the cage the radio stops playing because

  94.21: Which of the following statements about solid conductors inkal mhcav90ik / tuj*w6 y +/0bg/g1 dnn8s(hx electrostatics are tri 0b(nyug/kns0h9g l m kt8j /wh 6*/axdc+va1ue?
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 conductingl:q v:4hzk3n ybw u52w/a cl:x sphere of radius R has positive charge + Q. Which graph best depicts the electric potential as a function of r, th bnkxc45 2ul :wv:/h q3zlwa:ye distance from the center of the sphere?

  96.36: An isolated conducting sphere of radius R hrjr k 2cu0e1,pas positive charge + Q. Which graph best depicts the el u1erk0,j2pc rectric field as a function of r, the distance from the center of the sphere?

  96.21: Two isolated conducting spheres (S1 of radius 02h br tc*hr(z/u ag(jin;:. ps.030 m and initial charge + 6.0 nC and S2 of radius 0.040 m and initi/ (2b rhucpshji :zn;r a*g(t.al 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 different radii (cx-hscrxba n+ ni lh(y7*0 bt.2)ms b4$R_x>R_y$) 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 locab gr.dmvojln+d, 37 +vted at points 4 and 6 on the positive x axis. Which of the followingdj+lgd vbv nor73.,+ m graphs best represent the electrical potential along the axis?

  03.50: A solid uncharged conducting sphere has fu 5+o,vcon: 5xdfh-d 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 is the magnitude of the electric field at the position r = 4a from the center of the spheres as marked in the figure bo-h d +o5f:vxn,5fd ucy P?

  11.46: A hollow conducting sphere in static equns*3h:hr. c6pb ollp: ilibrium 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 has radius R=3a and tb:csnp o:6lrl h*h 3.phe 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 g5a z8rys-- gwjfc,.q conducting 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 center of the spheres is: f.cz,8-ws a r5jyg-gq

  04.50: A solid spherical conducting shell v2 -b(*ta ef /jabqav un-g29uhas inner radius a and outer radius 2a. At the center of the shell is located a point charge +Q. What must the excaqt uua* vv2-bj -/f2a(n9gbeess 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 she* n6a*uou pujeriz5rm 1j9g( +ll 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 the center o +marn*5pj(e6uur9z* 1oij u gf 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 co6)uz5g d; zdwj,ajlw hj.v8y,nductor has charge +Q and radius R. It is surrounded by a solid spherical shell with charge − Q, inner radius 2R, and outer radius 3R. Which of the followi,v,w8zjl ; .5juz6wayjh dd)gng 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 concentric charged conducting shells are in free space. The outeryn5 x8nk 1auk8gfr :6r shell has inner radius 2a and outer radius 3a. The inner she 8ukgan:18 56yxrfkrnll 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 ty)8cka., nhn/+mkjrisi (7qt*tf z 0vhat attempt to describe physicas0(j*m,yna. hzkt fi/8)qvit+k7c n rl phenomena. Which one of the following statements is correct?