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Cavity of radius r is in metal sphere of...

Cavity of radius r is in metal sphere of radius R .Charge Q is placed at centre of cavity.Metal is uncharged Find potential at point P (reference at oo ) (A) `(kQ)/(r)` (B) `(kQ)/(R)` (C) `(kQ)/(R)`-`(kQ)/(r)` (D) 0

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