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If the value of resistor becomes 16 times than its previous value then its noise voltage will become ________

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If the value of resistor becomes 16 times than its previous value then its noise voltage will become  ________

(a) 16 times

(b) 8 times

(c) 4 times

(d) 2 times

This question was addressed to me in an interview for job.

This key question is from Linear Modulation topic in division Amplitude Modulation of Analog Communications

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Correct choice is (c) 4 times

Easy explanation: Since the noise voltage is directly proportional to square root of resistance so if the value of resistor increased to 16 times then its noise voltage will become 4 times.

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