05.20: A portable radio that is playing is placed inside a screen cag, vxa1k,0d. 9vj ue(n(m.ag b nap3wwfe as shown. nawue xn,v bw19(( djak a3,.fpm.0vgWhen inside the cage the radio stops playing because

  94.21: Which of the following stat9mkw,a v z s n;rvp+jb4 0ejwefht;)1)ements about solid conductors in electrostatics are truezb e;v)ek+ v1j,s;9j)rh4fptwnm w a0?
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 09 co.-i0 mkjrfe n4nj-0 wntfR has positive charge + Q. Which graph best depicts the electric potential as a functioni mf9n 0 ctj-0kw on0jfr-.4en of r, the distance from the center of the sphere?

  96.36: An isolated conducting sphere of radius R has positive charge + t9npibig.kdq937 ) u3.jkztxt8 w 6 iyQ. Which graph best depicts the eiki i6ndw9 z tg.) 97tt38pby3qxu.jklectric field as a function of r, the distance from the center of the sphere?

  96.21: Two isolated conducting spheres (Sf noiyc4q:w znkp*y*1 (/g3 9ncxw f-n1 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 untifc/ f *iqxnnc(n zw1kg-y:y94on 3wp* l:

  17.46 Two copper spheres X and Y, with different r p fl(5usq28tyadii ($R_x>R_y$) 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 identicawrk+0jr,6;xd9c)ljln3pt q q l positive charges located at points 4 and 6 on the positivcjr,kqn0l d rjqx9l+63w ;pt )e x axis. Which of the following graphs best represent the electrical potential along the axis?

  03.50: A solid uncharged co3n0 5(mx/ygq hjzp* zc6jn xe4nducting 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 mac/(je60 jxg m3h5yqp zx4nzn *rked in the figure by P?

  11.46: A hollow conducting sphere in static equd(7)ero6 p cq gy38oggilibrium 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 the point of interest is at a locatiq8o(pgy36)georc7d gon r=2a from the center of the sphere at an angle of $60^{\circ}$with respect to the +x-axis.

  02.49: A solid, unchariie3gm mf ,9-iged 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 i- 3,9fgmiiimes:

  04.50: A solid spherical conducting shell has inner radius a and outer radiqxc 3k **v:ie8qy8nx uus 2a. At the center of the shell is located a point charge +Q. What must the ekex8q x3 inq8uy*:vc*xcess 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 shell h z;x:cf/4obojq3uh c :2zxm6vas a net charge +Q placed on it. Which of the following is the corre2z;cch j:fq zx6mb/o : uxvo34ct 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 1m w1hb5u7 md/-bgkes 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 following statements is true for the labeled points in the diagram? Assume these objects are isola- dwbm 1k1u /hm7bges5ted 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 outer ; t8 ojx3n3za nxw09hhshell has inner radius 2a and outer radius 3a. The inner shell has radius a. It; h8wx3h9 noan03xjtz 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 d5 blsnwi3 28fogrd) /s+ (wmrpresented below that attempt to describe physica)rw(8o+l2fmssrg3 5n dbi w/dl phenomena. Which one of the following statements is correct?