The circuit was in the shown state from a long time. Now the switch S is closed. The charged that flows through the switch is

Options

A. `400/3 muC`
B. `100muC`
C. `50muC`
D. `100/3 muC`

Answer

C

Explanation

Net charge under dotted box shown `=-q_(1)+q_(1)=0`
`V_(A)=25V`
`q_(1)=25(4)=100muC`
`q_(2)=25(2)=50muC`
Net charge under the dotted box shown `=-q_(1)+q_(2)`
`=-100+50=-50muC`
The charge which flows `=50muC`