1.

A point charge .Q. is placed at the centre of a spherical cavity of radius .b. created inside a solid conducting sphere of radius .a.. Then total electrostatic potential energy of the system is : [k=(1)/(4pi epsilon_(0))]

Answer»

`(KQ^(2))/(2)[(1)/(a)-(1)/(B)]`
`(KQ^(2))/(2)[(1)/(a)+(1)/(b)]`
`KQ^(2)[(1)/(a)+(1)/(b)]`
`2KQ^(2)[(1)/(a)+(1)/(b)]`

ANSWER :A


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