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Q.

Zener breakdown in a semiconductor diode occurs when

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a

Forward bias exceeds certain value

b

Reverse bias exceeds certain value

c

Potential barrier is reduced to zero

d

Forward current exceeds certain value

answer is B.

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Detailed Solution

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When reverse bias is increased, the electric field at the junction also increases. 

At some stage the electric field breaks the covalent bond, thus the large number of charge carriers are generated. 

This is called Zener breakdown.

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