Question

Find the current passing through battery immediately after key ($K$) is closed. It is given that initially all the capacitors are uncharged (Given that $R=6\Omega$ and $C=4\mu F$).

• A. $1A$
• B. $5A$
• C. $3A$
• D. $2A$

Answer 1

The correct option is A $1A$

At time $t=0$, resistance offered by a capacitor $=0$ and resistance offered by an inductor $=\alpha$.
$R_{net}=\frac{R}{2}+\frac{R}{3}=\frac{5R}{6}=5\Omega$
$\therefore$ Current from the battery,
$i=\frac{E}{R_{net}}=\frac{5}{5}=1A$