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A spherical conducting shell of inner radius $r_1$ and outer radius $r_2$ has a charge Q.A charge q is placed at the centre of the shell. What is the surface charge density on the inner and outer surfaces of the shell?

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$(B)\;\large\frac{Q+q}{4 \pi r^2_2}$
Hence b is the correct answer.
answered Jun 23, 2014 by meena.p
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