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  4. In forward bias the width of depletion layer decreases with increase in potential

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Q. In forward bias the width of depletion layer decreases with increase in potential

Haryana PMTHaryana PMT 2007

Solution:

In forward biasing, the forward bias voltage opposes the potential barrier $ {{V}_{B}} $ .
Due to it, the potential barrier is considerably reduced, the depletion region becomes thin, the potential barrier is much reduced and at some forward voltage ( $ 0.1 $ to $ 0.3V $ ), it is eliminated altogether.
Since, the small increase in forward voltage shows the large increase in forward current, hence the resistance of $p-n$ junction is low to the flow of current when forward biased.