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4. Show that a series LR circuit is a lowpass filter if the output is taken across the resistor. Calculate the corner frequency fc if L-20 mH and R 10 5. The circuit parameters for a series RLC bandstop filter are R-200 Ω, L-1 mH, C 40 pF. Calculate: (a) the center frequency (b) the half-power frequencies (c) the quality factor.

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lo x 103 3 f c

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