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RLC Circuits and Resonance

Q1: When a full band of frequencies is allowed to pass through a filter circuit to the output, the resonant circuit is called a:

A low-pass filter

B high-pass filter

C band-stop filter

D bandpass filter

ANS:D - bandpass filter

Consider a parallel R-L-C circuit. The equivalent impedance is given by the expression
Z=[{R*(1/C*R)*s}/{s^2+s*(1/C*R)+(1/L*C)}].

This equation represents a band pass filter with central frequency of (1/sqrt(LC)).



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