05.20: A portable radio that is playing is placed inside )7b.dld 0(u;g)hndsjv of2tu +l3hnxa screen cage as shown. When inside the vdog xb)f+th ;0n3 .ld)slj hnu7d(u2cage the radio stops playing because

  94.21: Which of the following statements about solid condh3kt7lrc / g3muctors in electrostatics rct/klm 3g7 h3are 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 Rir(9en p)i z*r has positive charge + Q. Which rrzi p9n( e*i)graph best 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 npel )p6( 2wi1gqmpn -R has positive charge + Q. Which graph best depicts the electric field as a function of r, the distance f iqpwnpp2-egn )1 (6mlrom the center of the sphere?

  96.21: Two isolated conducting spheres (S1 of radius 0.030 m and initi nu qped9ra3pirr5,e7+.x0 vial charge + 6.0 nC and S2 of radius 0.040 m ix5,q.3r p0rdnei 9 7+ vreuapand initial charge + 2.0 nC) are connected by a conducting wire. Charge will flow in the wire until:

  17.46 Two copper spheres )(c5mscg rj ,iX 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 identical positive charges loca d96+hkr wtpn3ted at points 4 and 6 on the positive x axis. Which of the following g rwnth+kp396draphs best represent the electrical potential along the axis?

  03.50: A solid uncharged zs1xv5 9a -ph50x s2cyciv 9riconducting sphere has 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 byav552 x r9z01isphicsv9 y cx- P?

  11.46: A hollow conducting sphere in stat/lwzy (nk)my2ic equilibrium 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 inte yml()2znwy /krior 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 6cqnsv(/6x5yd- -bmit*j y mo radius 3a contains a hollowed spherical region of radius a. A point charge +Q is placed at the common center td-yy6m 5o(vm n s/xb6cq-*ij 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 spherical conducting shell has inner radius a and outer radiu7 .uurkcne4n .s 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 eu. 4knc ur.7ninner and outer surfaces of the shell to be exactly equal?

  05.45: A spherical conducting shell has a net charge +Q placed on it. Whioz 3cw l+;uu7bch of the fw z;u7c+u bo3lollowing 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 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. It is surrounde,)mc :o svpd+qian3;xd 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 spherqcd )sn pm ox+,i:va3;es 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 chay9e3) dd+cddooof ,q1h+q ;y krged 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 kndodo9;yye c3q1d)k,+ho + qfd own 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 describzv :p w,fzv;cw5 hfp+9e physical phenomena. Which one of the following statements is c+zvpcvpf: hw,;f5 w9zorrect?