Question

In the given circuit, when the switch is closed, the capacitor charges with a time constant of

• A. $RC$
• B. $2RC$
• C. $\frac{1}{2}RC$
• D. $RC\log 2$

Answer 1

The correct option is A $RC$

The resistance in the middle plays no part in the charging process of $C$, as it does not alter either the potential difference across the $RC$ combination or the current through it.

Hence, Time constant $\tau =RC$

Hence, option (a) is the correct answer.