05.20: A portable radio that is playing qxgh p:mb .5jsa;2ym ;is placed inside a screen cage as shown. When inside the cage the radio jyq mh ;;smx.:a p52bg stops playing because

  94.21: Which of the following statements about solid conductors in electromq0y1.wh qt-t dc jlp*z3dz*-statics are ttzjwcd* p1l3*q.z-qdh0t-y mrue?
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 c8fcrif rp)z)guvlt.xr0 yry9 0k+ y++ onducting sphere of radius R has positive charge + Q. Which graph best depicts the electric potrrpr+)ut xvrlk8igz90+0yc +yf )yf. ential as a function of r, the distance from the center of the sphere?

  96.36: An isolated conducting sphere c1er t2/u,at lof radius R has positive charge + Q. Which graph best depicts the electric field as a fun,1 cuae tl2t/rction of r, the distance from the center of the sphere?

  96.21: Two isolated conducting spheres (S1 of radius 0.030 m+rf sitflo/ - uzge1zx )d-8.q and initial charge + 6.01 istu/ -.)+fr zog- edzfqxl8 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 until:

  17.46 Two copper spheres X and Y, with diffe*0lorrh,1 fl d)/o8k tg56trfjieh *arent 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 points 4 andk+o r6/mn/ndd 6 on the positive x axis. Which of the following graphs best represent the electrical potential along the axis? m6n/+ /o knddr

  03.50: A solid uncharged conducting sphere has radius 3a contains a hollowed fu9dqb p(49 p r1sy nze9ou1i7spherical 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 ofp e9puyb 1or71f u9(dq94zi sn 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 equilibrium is 2zbgp cnv3o(s/ l5rzz 2+ywh: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 location r=2a from the center of the sphe l5c ( r/2wvz3h+nz2gysoz:bpre at an angle of $60^{\circ}$with respect to the +x-axis.

  02.49: A solid, uncharged conducting sphere of radius 3a contains 0(x ijldzobbo3; a4/l a hollowed spherical region of radius a. A point charge +Q bjb o0l3i4azd(l;x/ o 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:

  04.50: A solid sphericafacmq s(si8e w1i (s: 7 k0;.jd*ekpxul 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 exce((:1.u is7sk k sm fpdiq;0*ecx a8wejss 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 has a net39vw*n 25xsih wxj vb9 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 of the sphere, point B is at the surface of the shell, a distance R from point A, and poin2vbh39x j 5vxnw s*w9it 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 surroundedoeq(ue wee r4rr2403i 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 di(4e2 0re ioe34 qreurwstance 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 shnlzu1h- t 2l3jells are in free space. The outer shell has inner radius 2a and outer radius 3a. The inner shj3lz l1u -2nthell 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 toa. l+fq gaj7 9vu)e:il describe physical phenomena. Which onev+g a9)qeu ilj:a7 .lf of the following statements is correct?