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What is the second harmonics of a wave form with fundamental frequency of 50Hz?

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What is the second harmonics of a wave form with fundamental frequency of 50Hz?

(a) 50Hz

(b) 150Hz

(c) 25Hz

(d) 100Hz

This question was addressed to me during an interview.

This is a very interesting question from Second Harmonic Distortion topic in portion Large Signal Amplifiers of Electronic Devices & Circuits

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Correct option is (d) 100Hz

For explanation I would say: The harmonics of a wave are the integer multiples of the fundamental frequency. Hence, the second harmonics of a wave with fundamental frequency 50Hz is 100Hz.

Second harmonics = 2 × fundamental frequency = 2 × 50Hz = 100Hz

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