In the filter circuit shown below the 3 dB cut-off frequency

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In the filter circuit shown below the 3 dB cut-off frequency is:

1. 10 kHz
2. 1.59 kHz
3. 354 Hz
4. 689 Hz

Correct Option: B

f_3dB =	1
	2πRC

Here R = R₁ || R₂ where R₁ = 3 kΩ
= 3 || 6 = 2 k R₂ = 6 kΩ

f_3dB =	1	= 1.59 kHz
	2π × 2 × 10³ × 50 × 10_–9