05.20: A portable radio that iyn r1dhvo(7gl u*j88uhkgswfil: ./6 s playing is placed inside a screen cage as shown. When inside h:78lh(i6n wgk* d. f1glvo /uu8jy rsthe cage the radio stops playing because

  94.21: Which of the following stapx rn) (cb68mktements about solid conductors in electrostatics rx8c6p)km bn(are true?
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 conduk9zgiu* (uq1v9zsn o9 cting sphere of radius R has positive charge + Q. Which graph best depicts the electric potential as a function of r, the distance fv99s1 uz*9qgo zk( uinrom the center of the sphere?

  96.36: An isolated conducting sphere 5qm,af/m4;ei3vor ra of radius R has positive charge + Q. Which graph best depicts the electric field as a function of ra;/vr5r34ea fm q o,im, the distance from the center of the sphere?

  96.21: Two isolated conductin8m0fxj 9.v5 pfl: iftt;1-dr xljec8uc3pe)e g spheres (S1 of radius 0.030 m and initial charge + 6.0 nC and S2 of radius 0.040 m and initial charge +tx9 cf e8c:dl83pf0r-1 uexflje ;t.jp5m ) iv 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 radiix( 7o2b t5rtt,svphe1 ($R_x>R_y$) 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 identica*y( zkq95op*yp* nojdeu 7/ xcl positive charges located at points 4 and 6 on the positive x axis. Which of the following graphs best represent the e y*nk(*ox5p up 7j/zcoyd*q9electrical potential along the axis?

  03.50: A solid uncharged coq h:qic1twj,rv 69p9pnducting sphere has radius 3a contains a hollowed spherical region of radius 2a. A point charge +Q is placed at a position a distance a from thir9p61jwvt c:pq, hq9 e 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 figure by P?

  11.46: A hollow conducting sphere in static equilibrium is isolatedy.)kd i0 s wjzm-,8awp 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 inter jw),w. 8d0pzi ym-ksaest 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 cdz,dl p- :nvl3pvjy 68onducting sphere of radius 3a contains a hollowed spherical region of radius a. A point charge +Q is placed at the common center of the spheres. Taking V = 0 as r → ∞ , the potentiyld6jdpv , n8v3lp-z:al at position r =2 a from the center of the spheres is:

  04.50: A solid spherical conducting shell has inner ra*o*q0u j +qrd7u3 ucvzdius 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 bevdoq*7 ru03 z qu+cuj* 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 7b1t 0p3z8ao z plscd*has a net 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 point C is a dp b0tz 3zo adpc7s1l*8istance R from point B outside the sphere. As r goes to infinity, V = 0.

  07.42: A solid spherical conductor0: -avhwxpvz5 r5x+gk 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 electric potential is zero as the distance from the spheres approaches infinity. Point A is at the centk-grxh5vz 5x +:vpw0a er 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 freectn : u5;paq..iscz /b space. The outer shell has inner radius 2a and outer radius 3a. The inner shell has radius a. It is known ts tcbzq ;n..ia5upc/:hat 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 statementsj re ra,iy;:pg* q2i0g presented below that attempt to describe physical phenomena. Which one of the f2,yi*p j ega;r0 iq:grollowing statements is correct?