Question

In which of the following circuits, is the current maximum, just after the switch $\left(\text{S}\right)$ is closed?

• A. $\left(i\right)$
• B. $\left(ii\right)$
• C. $\left(iii\right)$
• D. Data insufficient

Answer 1

The correct option is B $\left(ii\right)$

At $t=0$, the current flowing through the inductor is zero, so it acts as an open switch.

Hence, the circuits can be redrawn as shown below for $t=0$.


For circuit $\left(i\right)$:

$i_1=0$

For circuit $\left(ii\right)$:

$i_2=\frac{E}{R}$

For circuit $\left(iii\right)$:

$i_3=\frac{E}{2R}$

We can see that, $i_2>i_3>i_1$

Hence, option $\left(B\right)$ is the correct answer.