Q.

Why does capacitor block dc signal at steady state?

A. due to high frequency of dc signal
B. due to zero frequency of dc signal
C. capacitor doesnot pass any current at steady state
D. due to zero frequency of dc signal
Answer» D. due to zero frequency of dc signal
Explanation: frequency of dc signal is zero. so, capacitive reactance xc=1/2πfc becomes infinite and capacitor behaves as open circuit for dc signal. hence, capacitor block dc signal.
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