A spherical conducting shell of inner radius r1 and outer radius r2 has a charge Q.(a) A charge q is placed at the centre of the shell. What is the surface charge density on the inner and outer surfaces of theshell?(b) Is the electric field inside a cavity (with no charge) zero, even if the shell is not spherical, but has any irregular shape? Explain.

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Electric Charges and Fields

One of the fundamental properties is the electromagnetic property. Charge cannot be destroyed by any process and this contributes formally to the law of charge conservation.