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Photodiode is a device

1. Which is always operated in reverse bias
2. Which is always operated in forward bias
3. In which photo current is independent of intensity of incident radiation
4. Which may be operated in forward or reverse bias

Correct answer: Which is always operated in reverse bias

Solution

A photodiode is designed to operate in reverse bias so that incident light creates electron-hole pairs in the depletion region, producing a measurable photocurrent. Reverse bias improves sensitivity and response speed, while forward bias is not the normal operating mode.

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