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Passive Filters

Q1: A sinusoidal voltage with a peak-to-peak value of 18 V is applied to an RC low-pass filter. If the reactance at the input frequency is zero, the output voltage is

A 18 V peak-to-peak

B zero

C 9 V peak-to-peak

D 12.74 V peak-to-peak

ANS:B - zero

Xc = 1/2pifc.

RC low pass filter is connected in series combination.

I/p frequency is zero, so o/p becomes infinity reactance. Hence there is no o/p voltage.



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