05.20: A portable radio that is playingnao:wu k38yxk2/ b ;-pi)aqj z is placed inside a screen cage as shown. When inside the cage the rad38pjzbyx qwu-k ianka2)/;o :io stops playing because

  94.21: Which of the following statements about s(.yiej6f4l lsolid conductors in electrostatics are tr4y(6jl .iselfue?
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. 2g1h5:q g+w w pnqmsnu9o1m9r Which graph best depicts the electric potential as a function of r, thr pnng5s:omu w9qm1 h2 wqg9+1e distance from the center of the sphere?

  96.36: An isolated conducting sphere of radius R has positive ch)v+ y z*nt8t 5l0 h0orv9fnisxarge + Q. Which graph best depicts the electric field as a function of r, z o *)+snvhtv 8i5txn09fr 0ylthe distance from the center of the sphere?

  96.21: Two isolated conducting spheres (S1 of radius 0.030 m and init2 rj0gv ; *kddfr:u*nzial charge + 6.0 nC and S2 of radius 0.040 m fvjgr2*r*;:n dkzdu 0 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 different radhkb)r(ob8 i-d ii ($R_x>R_y$) 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.xsx ikilk c-*.(,fmn points 4 and 6 on th-. m k is(xxi,f*kl.cne positive x axis. Which of the following graphs best represent the electrical potential along the axis?

  03.50: A solid uncharged conducting sphere has radius 3a contains c 3s .l)je2ia3nm2xwba 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 fig3i3al 2) newcj.m2xbs ure by P?

  11.46: A hollow conducting sphere .vu4jtnbgz:tuc61efg n39;pdj 21 h uin static equilibrium is isolated in deep space with a net excess charge +Q on it. What is the electric potential (assuming V(r jgj;4gzuuv3pf2:bent dt h9.1c n16 u→ ∞) = 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 radius 3a contains a hollowpb5 /m)wq -k (ldbq i*ycfn(j6ed spherical region of radius a. A point charge +Q is pq5)f*q(-wlbc mb jp (id/6ynklaced 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 conductin )s ()o c1f 2alr4bbo8vokde6ozmmg*- 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 charge of the shell be in order for the charge density e mkvds8 ( zg)m)lofab-2o*46bc 1oroon the inner and outer surfaces of the shell to be exactly equal?

  05.45: A spherical conducting shell has a net jumy vq/ m)6bg7e3 e0yy;trt9charge +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 ey 6me0q9) 7mygt3;ruvjt by /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 ,hpju6cr5 g8 w+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 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 =3R8uh6,p wr 5gjc+ 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 chargprvlo*a.h,x8 ed 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 knar8ho,pl xv .*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 presendwgw59 dlnu9 9ted below that attempt to describe physical phenomena. Which one o5lg 9dw9nw ud9f the following statements is correct?