CapacitanceMedium

Question

In the above problem if the battery is disconnected before placing the plate, then new energy will be -

Options

A.K2U0
B.U0 /K2
C.U0 /K
D.KU0

Solution

Now, charge remains same on the plates. 
U0 = (given)   
Now energy  = U′  = (C)  Ans

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