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  4. A charge +q is placed somewhere inside the cavity of a thick conducting spherical shell of inner radius R1 and outer radius R 2. A charge +Q is placed at a distance r > R 2 from the centre of the shell. Then the electric field in the hollow cavity

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Q. A charge $+q$ is placed somewhere inside the cavity of a thick conducting spherical shell of inner radius $R_{1}$ and outer radius $R _{2}. A $charge $+Q$ is placed at a distance $r > R _{2}$ from the centre of the shell. Then the electric field in the hollow cavity

KVPYKVPY 2010Electrostatic Potential and Capacitance

Solution:

Following Gauss’ law, electric field inside cavity is proportional to enclosed charge $+ q$ only.