A parallel plate capacitor is first connected to D.C. source. It is then disconnected and then immersed in a liquid dielectric, then
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(a, b, d)
, and after immersing in the liquid, the capacity of the condenser increases. Its energy is lowered 
. Due to lowering of energy, the liquid level between the plates rises. This compensate the loss in electric potential energy by increasing the gravitational potential energy. As q is constant and c is increases, the potential on the plates is decreased
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