05.20: A portable radio that is playing is placed inside a screen /i2la7/,obmstf 3cche l b6u: cage as shown. When inside the cage the6e,bmsl/uth 7bcai2l :oc3f/ radio stops playing because

  94.21: Which of the following statements about solid conducimky( q /rsm y;t(:+)p*rnelotors in electrostatics ar)kt *n m( y lq;er+:yp/moris(e 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 y30 ag/(+pozn nt 21td-ekv lohrq f-*ty4n:cpositive charge + Q. Which graph best dpo0a3 yn1z-t :ly *todh+ qr4/n(ntvc-2egf kepicts 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 charge + Q. Which )it d,6 ta9vhnmn0k0y graph best depicts the elect6diy 90akn,mh)0tv t nric field as a function of r, the distance from the center of the sphere?

  96.21: Two isolated conduo2cv;t3iaq *pu pqc x8g-w ,q+c8qy)+ i(lpcucting spheres (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 conducting wire. Charge will flowpi8a-cpcui *uvy 3q+pco(,;)wxgtlq+8c2q q in the wire until:

  17.46 Two copper spheres X and Y, with different racf20u am6 sgj6dii ($R_x>R_y$) 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 points 4 h3r5)2-n eo/d2 jwihj xp,quhand 6 on the positive x axis. Which of the following graphs best r5j-w3qx)r2i2h , o d punhjeh/epresent the electrical potential along the axis?

  03.50: A solid uncharged conducting sphere has radius 3a qw*:gaya/j1k0i wqt:contains a hollowed spherical region of radius 2a. A point charge +Q is placed at a t:aqgqk 01yi*/: jwawposition 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 figure by P?

  11.46: A hollow conductingzm3yz s qb9s)k,.w2zx sphere in static 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? bz) s2ys .z3qwzmx9k,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 sxs59.9nqcfih sbn9ew6n;tn4 phere of radius 3a contains a hollowed spherical region of radius a. A poin.n n5hx e ib46sq9nswcft;n9 9t 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 condkwjogh- r; -t5ucting 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 the shell to be exactly equal? okh-5tg; rj- w

  05.45: A spherical conducfngbsl0q .)9pd+few ,ting shell has a net charge +Q placed on it. Which of the fobdeq+ )sw p.09nlf f,gllowing 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 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 surr 9oo dgq23:sdvci; v5nm.0tr nounded by a solid spherical shell with charge − Q, inner radius 2R, and outer radius 3R. Which of the following statements is true for ovo 9n.2 v0m i3dt;d: rnc5qgsthe 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 space. The ouj4oa:y 9 luwlt.baiw 3g (u3u6ter shell haiwj34o9( a6wlabu.gu 3u :yl ts inner radius 2a and outer radius 3a. The inner shell 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 statemelve407 9,mkybxh rl cjspwq-.. 9(hau nts presented below that attempt to describe physical phenomena. Which one of the following state-9.u.cs7 h r,( 4qeb0xvhlkmap9ywjl ments is correct?