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A variable condenser is permanently conn...

A variable condenser is permanently connect to a `100V` battery. If the capacity is charged from `2muE` to `10muF`, then change in energy is equal to

A

`2xx10^(-2) J`

B

`2.5 xx10^(-2) J`

C

`3.5 xx10^(-2) J`

D

`4xx10^(-2) J`

Text Solution

Verified by Experts

The correct Answer is:
D
`DeltaU = (U_f -U_i)`
`=1/2V^2 (C_2-C_1) =1/2 xx10^4 xx(10 -2) xx10^(-6)`
`=4 xx10^(-2) J`
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