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Passive Filters - Engineering

Q1:

An RL high-pass filter consists of a 470  resistor and a 600 mH coil. The output is taken across the coil. The circuit's critical frequency is

A 125 Hz

B 1,250 Hz

C 564 Hz

D 5,644 Hz

ANS:A - 125 Hz

Well, of course the cut-off frequency is when XL = R.

XL = ωL = 2*F*L.

And the time constant for LR circuit is L/R.

Therefore, the cut-off frequency, no matter if High-Pass/ Low-Pass: fc = R/(2*L).