Topic: Network Theory
The time constant for the circuit shown below is
- A. 0.2 microsecond
- B. 0.8 microsecond
- C. 0.4 microsecond
- D. 0.2 millisecond
Answer: D. 0.2 millisecond
Explanation: $R_{eq}=1k+(2k||2k)$\n$=1k+\frac{2k\times2k}{4k}=2~k\Omega$\nTime constant $=R_{eq}C_{eq}$\n$=2\times10^{3}\times0.1\times10^{-6}$\n$= 0.2$ milli second