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The value of N in dB is?

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The value of N in dB is?

(a) N = anti log(dB)

(b) N = anti log(dB/10)

(c) N = anti log(dB/20)

(d) N = anti log(dB/40)

The question was posed to me during a job interview.

My question is from Attenuators in chapter Filters and Attenuators of Network Theory

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The correct option is (c) N = anti log(dB/20)

Explanation: The value of N in dB can be expressed as N = anti log(dB/20).

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