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Question

The capacitor offers zero resistance to

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

The correct option is C A.C. only
Capacitive reactance is given as Xc=1ωC
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.

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