(25 points) 3. The figure shows a charged, conducting spherical shell of inner r
ID: 3280294 • Letter: #
Question
(25 points) 3. The figure shows a charged, conducting spherical shell of inner radius 4.00 cm and outer radius 6.00 em. At point A, which is a radial distance of 9.00 cm from the outer surface of the shell, the electric field is 6.20 x 10 N/C directed towards the center of the shell. (a) What is the net charge on the shell? [Give the sign and magnitude] (b) How much charge is on the inner surface and on the outer surface of the shell? [signs and magnitudes) (c) Suppose we place a charge O at the center of the charged shell so that the electric field at A becomes zero, how much charge is now on the inner surface and on the outer surface of the shell? [signs and magnitudes] 2002.-.... (o (o o1) C- C. )-(.Explanation / Answer
a] Here E = kq/r^2
6.2e4 = 9e9*q/(0.06+0.09)^2
q = 6.2e4*(0.06+0.09)^2/9e9
= 1.55*10^-7 C
b] inner surface has zero charge. Outer surface has 1.55*10^-7 C
c] Now Q at center will be negative of charge on shell, Q on inner surface is -Q.
So on inner surface , charge is 1.55*10^-7 C,
on outer surface, charge is zero
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