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Three capacitors of capacitances 3 muF, ...

Three capacitors of capacitances `3 muF, 9 muF` and `18 muF` are connected in series across a `120V` supply line. The Charged capacitors are then disconnected from the line and reconnected with plates of same polarities together and n0-external voltage. the charge on `3 muF` is

A

`36muC`

B

`72muC`

C

`108muC`

D

`144muC`

Text Solution

Verified by Experts

The correct Answer is:
B

Charge on each capacitor =`2xx120=240muC`
Common potential
`V=(240+240+240)/(3+9+18)=24V`
Final charge on `3muF:3xx24=72muC`
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