05.20: A portable radio that is pla4* t(-j,kqmn8qg.wo*ib hlfrl n ub0:ying is placed inside a screen cage as shown. When inside th4n*( f qq0 .8l*-b nwibm:og,rlutkhje cage the radio stops playing because

  94.21: Which of the following statements about solid conductors in electr*x(3pb4 ub cxbostatics are tru* xpbu(3b x4bce?
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 ra+rn; uq6q lq( uk,k0eq 6bb 0i)yw.pztdius R has positive charge + Q. Which graph bek ;),wu.0b(qq +i6by0zqpukrqetln 6 st depicts the electric 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 cha+6+ p+tba5 8 8y,u pjwofcklckrge + Q. Which graph best depicts t858, cp wj+tk pla +ku+o6fycbhe electric field as a function of r, the distance from the center of the sphere?

  96.21: Two isolated conducting spher 7wq8tb-ilu ym, 4hnw .k6 sx-+8 x2f*bfglbbkes (S1 of radius 0.030 m and initial charge + 6.0 nC and S2 of radius 0.040 m s, i l68-k *t+u2l8 4h.xqkny-7fwfxbgmb wbb 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 .5 +0 aws-wu0rmfbqbrand 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 chm7zphc(y(0ztb s4 du ;arges located at points 4 and 6 on the positive x axis. Which of the following grapd (s7p;(t mchz4z0uy bhs best represent the electrical potential along the axis?

  03.50: A solid uncharged conducting s+;mrsh :e311kovgd nbphere 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 g:1hb3d vm+oe 1;srnkcenter of the spheres as marked in the figure by P?

  11.46: A hollow conducting sphere in o,n h3rd*njb/ f6 kn5eqyj6 9vstatic equilibrium is isolated in deep space with a net excesyr *dnoh n5vje6kfn9bq/,j36s 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 angle of $60^{\circ}$with respect to the +x-axis.

  02.49: A solid, uncharged conducting sphere of 79n+nc3mltnlo(7tuom l gvmhdh v:+*+ i y1 -lradius 3a contains a hollowed spherical region of radius a. A point charge +Q is placed at the common center of the spheres. Taking V v9on++c *lt(h7 1+to nmmhinyl:dvm7-3ulg l= 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 radiusi4j rjjw 1x,oqr/:5r h 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 oute :r5,xi1oj4wrjq/hjrr surfaces of the shell to be exactly equal?

  05.45: A spherical covgvi: m;2rje16 fx+x:.zm8n9p nvcvp nducting shell has a net charge +Q placed on it. Which of the following is the correct relationship for the electric potential at the pxn6mf2iv8+n c.ve v1px:vgj9 z:p;m r oints 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 has charge +Q an8 v ufmm,k0v 2+e,y*v7ny 6 ow.lnkpahd 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 =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 spher6+uh2om*wmyp,. en v 8lk nvy af70v,ke.

  15.48: Two concentric charged conducting shells are in free space. The outer shebssaw4e2a/) n ll has inner radius 2a and outer radius 3a. The inner shell has radius a. It is known that the electrinswab ea4s /)2c 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 presentkmc0tmwb 10 v+ed below that attempt to describe physical phenomena. Which one of t +bcm0mwvtk01 he following statements is correct?