05.20: A portable radio t .ru4tnmnkkt4 t-qa8y ,gkl/ :hat is playing is placed inside a screen cage as shown. When inside the c -/n:ty ltknq8g,km t k4r4.auage the radio stops playing because

  94.21: Which of the following statc jk ke1n1ng6.t94wmyvjrpie .,t 4,tements about solid conductors in electrostatics ntki,n.tg 1kj4jcmw6 re, pe y491 .tvare 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 conducting sphere of radius R has positim -1 o/mgilmo)wv c;k1pk -;hpve charge + Q. Which graph best depicts the electric pomoop1l kwvc; m ) mg;h-k1-p/itential as a function of r, the distance from the center of the sphere?

  96.36: An isolated conducting sphere of radius R has positive chahi9 )(6ggjdx r-(upd1g+ u0nycjk p8irge + Q. Which graph best depicts the electric field as a function of r, the distance fromyp6(rkdij0 ugc png 8(hx) -9ig1j+du the center of the sphere?

  96.21: Two isolated conducting sphej,de18)v n-plgw0dn z res (S1 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 connected by a conductpjeg)v 1dl 08z d,wn-ning wire. Charge will flow in the wire until:

  17.46 Two copper spheres X and Y, with dvv4u xk.k yo0i-* f;) hlczsp3ifferent 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 charges located aag.c3tj1a,sufct 6) dpf/j/ mt points 4 and 6 on the positive x accu, 3/f/t6 dm )g1at.fjsjap xis. Which of the following graphs best represent the electrical potential along the axis?

  03.50: A solid uncharged conducting sphere has radius 3a con6fp93 5qrcj2-xhgu titains 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 center of the sp3rhp2 6fxuctj-g59i qheres as marked in the figure by P?

  11.46: A hollow conducting sphere in static equilibr(u1abfe ap/72 m c9aphium 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 radb2ca pfm1hp9 a(au/7eius 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 c- o.gfyq wym(e*+w8e: 3gm ); movfvkconducting 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. yvk) cg3m:+(g;w eey.-fmfo *vmwo 8qTaking V = 0 as r → ∞ , the potential at position r =2 a from the center of the spheres is:

  04.50: A solid spherical cond*zmc rman8,ze +cllrru b -o :;w;6bm3ucting 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 on the inner and outer surfaces of them-bcew8m rlu;;rzmbz +3:ano* ,clr6 shell to be exactly equal?

  05.45: A spherical conducting shell has a net charge +Q placed on it. Which6y bw5:jshx-m 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 fj b-m5h6ywx :srom 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 conductoxp7a(n4o, /d4x 0 x7giwmzlh;n dy*k y:biuw:r 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 dpxa/ ky74on: ydm:ixw* w0, zgl( bun;dhx4i7iagram? 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 space. The outer 3xr, : fpsa ccongag0/gi4:v, shell has inner radius 2a and outer radius 3a. The inner shell has radius a. It is known that thecx,0sfia :g,o g:n34g pvrc/a 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 prew-hvv) th6)v ysented below that attempt to describe physical phenomena. Whiwyv )vh6h)-t vch one of the following statements is correct?