A 10 kHz even-symmetric square wave is passed through a

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A 10 kHz even-symmetric square wave is passed through a bandpass filter with centre frequency at 30 kHz and 3 dB passband of 6 kHz. The filter output is

1. a highly attenuated square wave at 10 kHz.
2. nearly zero
3. a nearly perfect cosine wave at 30 kHz
4. a nearly perfect sine wave at 30 kHz

Correct Option: C

NA