The plate separation in a parallel plate condenser is d and plate area is A. If it is charged to V volt & battery is disconnected then the work done in increasing the plate separation to 2d will be –
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
D
As battery is disconnected, charge remains constant in the work process.
Work done = final potential energy – initial potential energy
= 
– 
= 
Where, Q = CV = 
, C = 
& C´ = 
Now, work done = 
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