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A solid sphere of radius 'R' has a cavit...

A solid sphere of radius 'R' has a cavity of radius `(R)/(2)`. The solid part has a uniform charge density `'rho'` and cavity has no charge. Find the electric potential at point 'A'. Also find the electric field (only magnitude) at point 'C' inside the cavity

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The correct Answer is:
`V_(A)=(5 rhoR^(2))/(12 epsilon_(0)),E_(C)=(rhoR)/(6 epsilon_(0))`
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