Question

Consider the circuit shown in figure, after switch $S$ is closed. What amount of charge will flow through the switch?

• A. $20\mu C$
• B. $60\mu C$
• C. $40\mu C$
• D. no charge will flow

Answer 1

The correct option is B $60\mu C$

Figure (a) corresponds to when switch is open.
Figure (b) corresponds to when switch is closed.
Various charges flowing after closing the switch are as follows:
$\Delta q_1=60-40=20\mu C$
$\Delta q_2=20-0=20\mu C$
$\Delta q_3=20-0=20\mu C$
$\Delta q_4=\Delta q_1+\Delta q_2+\Delta q_3=60\mu C$