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After cut-in voltage AC resistance of diode ____________

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After cut-in voltage AC resistance of diode ____________

(a) Slightly decreases

(b) Decreases exponentially

(c) Slightly increases

(d) Increases exponentially

The question was asked in a job interview.

This key question is from Resistance Level topic in portion Diode Circuit of Analog Circuits

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Correct answer is (b) Decreases exponentially

The best I can explain: After cut-in voltage current exponentially increases with small increase in voltage. This will considerably reduce resistance.

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