A conducting spherical shell has inner radius a and outer radius b and carries net charge Q. A point charge q is fixed at the centre of its cavity. The electrostatic energy stored in the electric field within the conducting material a<r<b is:
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Question

A conducting spherical shell has inner radius a and outer radius b and carries net charge Q. A point charge q is fixed at the centre of its cavity. The electrostatic energy stored in the electric field within the conducting material a<r<b is:

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G1 Physics · Accepted Answer

In electrostatic equilibrium the electric field inside the bulk of a conductor is zero. Therefore the field-energy density u=½ε₀E² vanishes everywhere for a<r<b, so the energy stored in that material region is zero.

A conducting spherical shell has inner radius a and outer radius b and carries net charge Q. A point charge q is fixed at the centre of its cavity. The electrostatic energy stored in the electric field within the conducting material a&lt;r&lt;b is:

A conducting spherical shell has inner radius a and outer radius b and carries net charge Q. A point charge q is fixed at the centre of its cavity. The electrostatic energy stored in the electric field within the conducting material a<r<b is: