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In the given figure that work done by th...

In the given figure that work done by the battery after the switch S is closed is

A

`100muJ`

B

`-100muJ`

C

`80muJ`

D

`-80muJ`

Text Solution

Verified by Experts

The correct Answer is:
C
Before the switch S is closed
`Q_(i)=C_(eq)V`
`=5xx4=20muC`
When the switch S is closed
`Q_(f)=CV`
`=10xx4=40muC`
W(cell)`=DeltaQE=(Q_(f)-Q_(i)) xx E`
`=20 xx 4 =80muJ`
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