A `3muF` and a `5muF` capacitor are connected in series across a `30V` battery. A `7muF` capacitor is then connected in parallel across the `3muF` capacitor. Choose the INCORRECT option :

Options

A. Voltage across `3muF` capacitor before connecting `7muF` capacitor is 18.75V
B. Charge flown through battery after connecting `7muF` capacitor is 43.75 `muC`
C. `5muF` capacitor and `7muF` capasitor can be said to be in series.
D. After connecting `7muF` capacitor, it has charge of `70muC`

Answer

C

Explanation

`q_(2)/7=(56.25+q_(1))/3 ....(1)`
`q_(2)/7+(56.25+q_(1)+q_(2))/5=30 .......(2)`
`:. q_(2)=70,q_(1)=-26.25`
`:. q=43.75`