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An isolated metallic object is charged in vacuum to a potential V0 using a suitable source, its electrostatic energy being W0. It is then disconnected from the source and immersed in a large volume of dielectric with dielectric constant K. The electrostatic energy of the sphere in the dielectric is :
(A) K2W0
(B) K W0
(C) W0/K2
(D) W0/K
An isolated metallic object is charged in vacuum to a potential V0 using a suitable source, its electrostatic energy being W0. It is then disconnected from the source and immersed in a large volume of dielectric with dielectric constant K. The electrostatic energy of the sphere in the dielectric is :
(A) K2W0
(B) K W0
(C) W0/K2
(D) W0/K
Correct option (D) W0/K
Explanation:
U = Q2 /2C since C will become k times
So U will become 1/k times