Question

Find the current $I_1$ long after pressing the switch S.
Given: $E=10V,R_1=2\Omega ,R_2=3\Omega ,R_3=6\Omega$ and $L=5H$.

• A. $\frac{10}{5}A$
• B. $\frac{10}{4}A$.
• C. $\frac{10}{12}A$.
• D. $\frac{10}{6}A$.

Answer 1

The correct option is B $\frac{10}{4}A$.

L is not to be considered. This is because after pressing the switch for long, the current has become steady.
Now, $R_2$ and $R_3$ can be considered parallel.
So, equivalent resistance will be :
$\frac{3\times 6}{3+6}+2\Omega =4\Omega$


So, $I_1=\frac{10}{4}A$.