# A spherical conducting shell of inner radius r1 and outer radius r2 has a charge Q.A charge q is placecd at the centre of th shell. What is the surface charge density on the inner and outer surfaces of the shell?

We have,
radii $=r_{1}, r_{2}$
charge $=Q, q$
So,
Surface charge density on the inner surface is:
$\frac{q}{4 \pi r_{1}^{2}}$
Surface charge density on the outer surface is:
$\frac{q+Q}{4 \pi r_{2}^{2}} from$

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