Question

Statement I: Capacitor serves as a block for DC and offers an easy path to $AC$.
Statement II: Capacitive reactance is inversely proportional to frequency.

• A. If both statements are true and statement II is the correct explanation of statement $I$.
• B. If both statements are true but statement II is not the correct explanation of statement $I$.
• C. If statement $I$ is true but statement II is false.
• D. If both statements are false.

Answer 1

Answer: (A)

The capacitive reactance of capacitor is given by

$X_C=\frac{1}{\omega C}=\frac{1}{2\pi fC}$
So this is infinite for $DC(f=0)$ and has a very small value for $AC$. Therefore, a capacitor blocks $DC$.