Question

The capacitor offers zero resistance to

• A. D.C. only
• B. A.C. & D.C.
• C. A.C. only
• D. neither A.C. nor D.C.

Answer 1

The correct option is C A.C. only

Capacitive reactance is given as $X_c=\frac{1}{\omega C}$
From this relation we can see that the value of capacitive reactance and therefore its overall impedance (in Ohms) decreases to zero as the frequency increases acting like a short circuit.
Likewise, as the frequency approaches zero or DC, the capacitors reactance increases to infinity, acting like an open circuit which is why capacitors block DC.