Question

When the switch is closed, the net charge which flows from point A to B is

• A. $-\frac{400}{7}\mu C$
• B. $-\frac{100}{7}\mu C$
• C. $-\frac{200}{7}\mu C$
• D. $-\frac{500}{7}\mu C$

Answer 1

The correct option is A $-\frac{400}{7}\mu C$

Equivalent circuit:


$C_{eq}=\frac{5}{3}\mu F$

Initial charge distribution:


After closing the switch,

$\therefore C_{eq}=\frac{25}{7}$

The new charge distribution will be


$q=\frac{400}{7}\mu C$