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A point charge Q is placed at the centre...

A point charge Q is placed at the centre of an uncharged spherical shell of inner radius a and outer radius b. There is a small tunnel in the body of the shell. Calculate the work done to transfer the charge through the tunnel to infinity.
[Hint: Remove the charge bit by bit and calculate the total work done.]

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Verified by Experts

The correct Answer is:
`(Q^(2))/(8piepsilon_(0))((1)/(a)-(1)/(b))`
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