# A spherical conducting shell of inner radius r1 and outer radius r2 has a charge Q. A charge q is placed at the centre of the cell.(a) What is the surface charge density on the (i) inner surface (ii) outer surface of the shell.(b) Write the expression for electric field at a point x r2 from the centre of the shell.

Surface charge density on the inner surface is

Surface charge density on the outer surface is

For finding the electric field at a distance x from the center, we need to apply Gauss's law.

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