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Question

When p-n junction diode is forward biased, potential barrier
  1. increases
  2. remains the same
  3. decreases
  4. may increase or decrease

A
remains the same
B
increases
C
may increase or decrease
D
decreases
Solution
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The correct option is C decreases
The width of the depletion layer in a p-n junction diode decreases in forward bias due to repulsion of carriers from battery terminals, holes from p-type and electrons from n-type. Now, due to small number of ions in depletion region its potential decreases.

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