05.20: A portable radio that is playing is placed inside a screen cag )t(m pwm4lm+0guz(i4j dz9g ga,yx/ opn9m :le as sho,oiz94am) ly4m9pzw 0( xgp(dnmtlg /gm:ju+wn. When inside the cage the radio stops playing because

  94.21: Which of the following statements about so 4 wh(huwib4a8, kk.ie.qy,qolid conductors in electrostatics are ui.( ,ib qkohka.h w,4y4wq8etrue?
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 9a h4c;lu xuw ::lwo7chas positive charge + Q. Which graph best depicts the e;4cc xw7o:awu l: hul9lectric potential as a function of r, the distance from the center of the sphere?

  96.36: An isolated conducting sp1-qa+ia7ug m*m6olx ghere of radius R has positive charge + Q. Which graph best+ag i xm1gl6*aoq-u7m depicts the electric field as a function of r, the distance from the center of the sphere?

  96.21: Two isolated conducting spheres (S*dy h(jngq ufnj e grlyi0mr-:;e:5+*1 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 c-u j0 5j g :m*lr;irhe q*ed+y:yfn(ngonnected by a conducting wire. Charge will flow in the wire until:

  17.46 Two copper spheres .:clw (:vxvk a6cs 25wbvzrb-.x6 s ijX 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 positivecz11e phyr:on3 3tsvt5* kcm, charges located at points 4 and 6 on the positive x axis. t:rozht31 n k*3c cpeyms,v15 Which of the following graphs best represent the electrical potential along the axis?

  03.50: A solid uncharged conducting sphere h-yr0 i j1s8mfjas 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.ymsr f-10 jj8i What is the magnitude of 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 conducp)zozh (8vo p0pok3cmw (: u/ vj+c;rjting sphere in static 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 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 angzc8crwv0ozp +( ( ;h3 jomo)k: pvuj/ple of $60^{\circ}$with respect to the +x-axis.

  02.49: A solid, uncharged conducting sphere of rdre jc 0.cyagn.c0 qj; zoz26-adius 3a contains a hollowed spherical reco 0- jgz.c;qj2der.cz n6ya 0gion 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:

  04.50: A solid spherical conducting shell has inner radius a and outer radim685 m(rgecps5s sjr;)v s op(us 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 inner and outer surfaces of the shm8)rv5 s sgo6se (mpcj5r;(psell to be exactly equal?

  05.45: A spherical conducting shell has a net charge +Q placed on it. Which of qoh1-v 2- thdy(kp2ab/ 0s9tlkl*ccj2nzx9 q 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 sdlcy-k1qcq-9k(ht *v2naox sbp /z0h2l29tj hell, 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 -nvoj+k8c6t 9 ymz vl8zj s)e7conductor 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 isolated in space and that the elec6ely o njsv8kv7czj)+-zt8m9tric 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 shelyudc5l + u yn73.psvn,ls are in free space. The outer shell has inner radius 2a and outer radius 3a. The inner shell has radius a. It is known thuln, yy3ps .7dn+c5vu at 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 stmtp8elsq 4 06gatements presented below that attempt to describe physical phenomena. Which one of the following st860tg 4 qpelsmatements is correct?