05.20: A portable radio thakviosq +gm/ j*q;9,n qt is playing is placed inside a screen cage as sho9+ qjmqno;vs/* ,k giqwn. When inside the cage the radio stops playing because

  94.21: Which of the following stat)d4 t-pfkse 2hements about solid conductors in electrostatics are thf t p-des4)k2rue?
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 c4 oeek wm)4by8harge + Q. Which graph best depicts the elect4emwe4o kb 8y)ric potential as a function of r, the distance from the center of the sphere?

  96.36: An isolated conducting sphere of radius R has positive charge + Q. Whsn,h4e ;x* i(rgoq;g hich granq r hoi*gsg ;4;h(e,xph best depicts the electric field as a function of r, the distance from the center of the sphere?

  96.21: Two isolated conducting spheres (S1 8hw jyrv3 mi5 w*qksvg25/v )kof radius 0.030 m and initial charge + 6.0 nC and S2 of radius 0.040 m and initial charge + 2.0 nC) are con w53sv2ijkv5vyr8 ) km/*gw qhnected by a conducting wire. Charge will flow in the wire until:

  17.46 Two copper spheres X ahw cj f(pm9/lp/.h+ bond 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 positive chargefq3 b3y-dsa) zi e(pjn8)8onws located at points 4 and 6 on the positive x axis. Which of the following graphs best represent the electrical potentenwo)dz y3 8-) i 3sq(anpfb8jial along the axis?

  03.50: A solid uncharged conducting sphere has radius 3a contains a hod(-exp; 0jw* ; usxb:rndev;ollowed 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 fieldpxvd(;*n;owurd 0jbxe- ;s:e 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 stati v246+doni(/rb zyv- y /an 7lty;ebouc 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 adnly/e4utozb72 ionvv/6b +yr; -y (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 conducqab 7dgg2hen1,:, eivting sphere of radius 3a contains a hollowed spheriqd h 2iavbne:7,1g,ge cal 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 is:

  04.50: A solid spherical conducti (v+7.heo,xyl ;eentw6ca ,tnng 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 chargvn.elx, ,(t7+ na6hece ytow;e density on the inner and outer surfaces of the shell to be exactly equal?

  05.45: A spherical conducting shell has a net charge +Q placed o sao k04qwk:ss7/xl 0he+gd. gn it. Which of the following is the correct relationship for the electric potential at the points labeled A, B, and C? Point A isss740 /dk l :h awkx+oesgg0.q 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 has charge +Q and radius R. It is sub1 kzw5gefb bn52.j3 nrrounded by a solid spherical shell with charge − Q, inner r1 2g ez553bjfbk.n nbwadius 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 =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 spac4-uoqvoc n *s5ds92v0sn /amkjw4bm,e. The outer shell has inner radius 2a and outer radius 3a. The inner shelusvqadkmbmvs wc 5-4,s9n0n /4oj o2*l 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 be7 s-5w)omeqh qlow that attempt to describe physical phenomena. Which one of the following statements isow -7 s)e5qqmh correct?