Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R Assertion A: Photodiodes are used in forward bias usually for measuring the light intensity. Reason R: For a p-n junction diode, at applied voltage V the current in the forward bias is more than the current in the reverse bias for |Vz| > ± V ≥ |V₀| where V₀ is the threshold voltage and Vz is the breakdown voltage. In the light of the above statements, choose the correct answer from the options given below (a) Both A and R are true but R is NOT the correct explanation of A (b) A is true but R is false (c) Both A and R are true and R is the correct explanation of A (d) A is false but R is true

Answer: (d). Assertion A: photodiodes are operated in reverse bias for measuring light intensity, not forward bias, so A is false. Reason R: beyond the threshold voltage the forward current (mA) is much larger than the reverse current ( μ A) before breakdown, so R is true. So the answer is (d) A is false but R is true.

Given below are two statements: one is labelled as Assertion A and… | JEE Main 2023 (25 Jan, Shift 1)

Q46JEE Main 2023 · 25 JAN · SHIFT 1Medium

Special Purpose Diodes

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

Assertion A: Photodiodes are used in forward bias usually for measuring the light intensity. Reason R: For a p-n junction diode, at applied voltage V the current in the forward bias is more than the current in the reverse bias for $|\text{V}_\text{z}| > \pm \text{V} \geq |\text{V}_0|$ where $\text{V}_0$ is the threshold voltage and $\text{V}_\text{z}$ is the breakdown voltage.

In the light of the above statements, choose the correct answer from the options given below

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Answer: (d)

Assertion A: photodiodes are operated in reverse bias for measuring light intensity, not forward bias, so A is false.
Reason R: beyond the threshold voltage the forward current (mA) is much larger than the reverse current ( $\mu$ A) before breakdown, so R is true.
So the answer is (d) A is false but R is true.

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Special Purpose Diodes question from JEE Main 2023 (25 Jan, Shift 1)

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