Question

The capacitive reactance of a capacitor connected to 50 V d.c. is

• A. zero.
• B. \(10\Omega\).
• C. \(50\Omega\).
• D. infinity.

Hint:

Capacitive reactance depends on frequency, and direct current has zero frequency.

Answer 1

The Correct Option is D

Step 1: Physical Picture
Once a capacitor is fully charged by a d.c. source, no steady current flows through it.

Step 2: Resistance Idea
No current for a fixed voltage means the opposition to current is infinitely large.

Step 3: Elimination
Zero, $10\,\Omega$ or $50\,\Omega$ would allow a current, so only infinity is correct.

Final Answer:
The reactance is infinite. \[ \boxed{\text{(D) }\text{infinity.}} \]