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Solution


Q.

Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R                        [2023]

Assertion A: Photodiodes are preferably operated in reverse bias condition for light intensity measurement.

Reason R: The current in the forward bias is more than the current in the reverse bias for a p–n junction diode.

In the light of the above statements, choose the correct answer from the options given below:
1 A is true but R is false  
2 Both A and R are true and R is the correct explanation of A  
3 A is false but R is true  
4 Both A and R are true but R is NOT the correct explanation of A  

Ans.

(4)

Photodiodes are operated in reverse bias as fractional change in current due to light is more easy to detect in reverse bias.