question_answer

The width of depletion layer in a\[p-n\] junction diode

A)  increases when a forward bias is applied

B)  increases when a reverse bias is applied

C)  decreases when a reverse bias is applied

D)  remains same irrespective of bias voltage

Correct Answer: B

Solution :

                In reverse biasing mode, the applied voltage V mostly drops across the depletion region of p-n junction and its direction of voltage is same as that of potential barrier\[{{V}_{B}}\]. Due to it, the reverse bias voltage supports the potential barrier, hence, increasing the barrier height and width of depletion layer.