05.20: A portable radio7yjeh m wilzv* i49a/7 that is playing is placed inside a screen cage as shovizh*7eajy97 m lw4/iwn. When inside the cage the radio stops playing because

  94.21: Which of the following statements about solid conductors in electrostati(sb ).t;5ijnw1 abi wics are(njai.i )ws; tb1w5i b 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. W9*pfojab cpt /qb*z;2hich graph best depicts the electric potential as a function of r, the disqbpcp*t2 b9za;f/o *jtance from the center of the sphere?

  96.36: An isolated conducting spherc7tf8,z bq-y wjjl-9 ge of radius R has positive charge + Q. Which graph bes-bq9-lwtzc 8jg fy,7jt 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 inw34crih (js3o+pk v8/x ux ag2itial 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 w/2 ux3ci3a(8o 4 +skj phvxrguntil:

  17.46 Two copper spheres X and Y, fia)*e alcuwo i8(21,qn dbx4 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 p bpx)zab:, l c5n9w y1cc+8qdofk5lk2 oints 4 and 6 on the positive xxc5n p 95wqa1:8 )loczkb,bkd 2y+lcf axis. Which of the following graphs best represent the electrical potential along the axis?

  03.50: A solid uncharged conducting sphere has radius 3a l gj6dukmg0t 8y-5*i jcontains 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 spher6ykjj*m-8 t l0gg5du ies as marked in the figure by P?

  11.46: A hollow conducting xac4s p/ g.4jcbb51dm sphere in static equilibrium is isolated in deep space with a net excess charge +Q on it. What is the electric csbcmdg4jx 1 4./ab 5p potential (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 rad5xp7j 3ug m7zmpep+puk/:fn) ius 3a contains a hollowed spherical region of radius a. A point charge +Q is placed at the common center of the spheres. Taking 7p:pxezm+ n /37k)5uguf jmppV = 0 as r → ∞ , the potential at position r =2 a from the center of the spheres is:

  04.50: A solid spherical conductinxrbt t8z*n9:b g 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 charget bn9brxz8:*t 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 shell has a net charge +7e h+ *t-v(a- vvey+;pvhnz)4wb jpwj 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 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 tt7v vp- e+hezjv 4w+ w) np(v*a-b;yjho infinity, V = 0.

  07.42: A solid spherical conductor has charge +Q and radius R. Iye/apvx,y,tz,-tf, ;1 yjsjyt 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 itt1ez,a x,yj,v ps-y,;/yfj y slocated 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 outer su/); a**i+-f e3k it xrw+a.s kwqvmrrhell has inner radius 2a an;f/rwx3wqeukr+ a*r v m*+i.tas-)ikd outer radius 3a. The inner shell 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 that attempt to describe p*3w6v,kkc qffhysical phenomenw ck,f*6 3kfvqa. Which one of the following statements is correct?