The time constant of the network shown in the given figure is given by
1
\(\rm \frac{L}{R3+\frac{R1R2}{R1+R2}}\)
2
\(\rm \frac{L}{R3+R1+R2}\)
3
\(\rm \frac{L}{\frac{1}{R_1}+\frac{1}{R2}+\frac{1}{R3}}\)
4
\(\rm \frac{L}{\frac{R1R2}{R1+R2}}\)
The time constant of the network shown in the given figure is given by