A variable condenser is permanetly conne...

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

`2xx10^(-2)J`

`2.5xx10^(-2)J`

`6.5xx10^(-2)J`

`4xx10^(-2)J`

Text Solution

Verified by Experts

The correct Answer is:

`deltaE=1/2C_(2)V^(2)-1/2C_(1)V^(2)`
`=1/2xx10xx10^(-6)xx10^(4)-1/2 2xx10^(-6)xx10^(4)`
`=4xx10^(-2)J`

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