Answer :

Given,


R is the radius of the sphere and Q is a point charge


Formula used


We know that for a sphere or a point charge, the capacitance can be found out by the equation,



Now, to find energy stored, we have the relation,



Here the point charge has Q amount of charge and capacitance C is as given above. So by substitution,



Hence the expression for energy stored on a sphere around a point charge placed at the origin is Q2/8πε0×R) J


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