Question

Consider the circuit shown in the figure below, switch is operated at $\tau =0$
The time constant of the given circuit is

• A. $20ms$
• B. $40ms$
• C. $8ms$
• D. $16ms$

Answer 1

The correct option is D $16ms$

For time constant calculation, the circuit can be redrawn as


where, $R_{eq}=8k\Omega$
and $C_{eq}=2\mu F$
$\therefore \tau =R_{eq}{C}_{eq}=16ms$