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Avalanche breakdown in a semi conductor diode occurs when

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forward current exceeds certain value

Forward bias exceeds certain value

the potential barrier is reduced to zero

Reverse bias exceeds a certain value

answer is D.

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Detailed Solution

When Zener diode is in reverse bias and when sufficiently high potential is applied then the covalent band near the junction break down. Then reverse current increases abruptly to high value. This is called Avalanche breakdown.

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