Consider the circuit shown is after switch S is closed.

What amount of charge will flow through the switch?

Options

A. `20 muC`
B. `60 muC`
C. `40 muF`
D. no charge will flow

Answer

B

Explanation

Figure (a) corresponds to when switch is open.
Figure (b) corresponds to when switch is closed.
.
.
Varous charges flowing after closing the switch are as follows:
`Deltaq_(1)=60-40=20 muC`
`Deltaq_(2)=20-0=20 muC`
`Deltaq_(3)=20-0=20 muC`
`Deltaq_(4)=Deltaq_(1)+Deltaq_(2)+Deltaq_(3) =60muC`.