Given below are two statements: one is labeled as Assertion A and the other is labeled 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 where is the threshold voltage and is the breakdown voltage.
In the light of the above statements, choose the correct answer from the options given below
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 where is the threshold voltage and 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 and R is correct explanation A
- (B)Both A and R are true but R is NOT the correct explanation A
- (C)A is false but R is true✓ Correct
- (D)A is true but R is false
Answer: (C)
Solution
A photodiode is run in reverse bias, where the reverse current rises in proportion to the incident light intensity and so measures it conveniently; the statement that it is used in forward bias is therefore wrong, and the assertion is false. The reason stands on its own ground: for a junction diode the forward current at a given magnitude of applied voltage far exceeds the reverse current over the stated range, which is a correct statement. The assertion is false while the reason is true.
JEE Main · 2023 · 25 Jan 2023 · Shift 1 · Single correct option