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Passive Filters - Engineering

Q1:

In a certain low-pass filter, fc = 3.5 kHz. Its passband is

A 0 Hz to 3.5 kHz

B 0 Hz

C 3.5 kHz

D 7 kHz

ANS:A - 0 Hz to 3.5 kHz

A low pass filter passes only low-frequency signals.
Here fc = 3.5khz so, the filter passes frequencies below fc.