Question

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

• A. $\frac{400}{3}\mu C$
• B. $100\mu C$
• C. $50\mu C$
• D. $\frac{100}{3}\mu C$

Answer 1

The correct option is C $50\mu C$


Net charge under dotted box shown
$=–q_1+q_1=0$
Finally,
$V_A=25V$

$q_1=25\left(4\right)=100\mu C$
$q_2=25\left(2\right)=50\mu C$
Net charge under the dotted box shown
$=-q_1+q_2$
$=-100+50=-50\mu C$
$\therefore$ The charge which flows $=50\mu C$