JEE Main 2022 · 25 Jun · Shift 1 · Physics Q47

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PhysicsSingle correct+4 / -1Question 47 of 90

The photodiode is used to detect the optical signals. These diodes are preferably operated in reverse biased mode because :

fractional change in majority carriers produce higher forward bias current

fractional change in majority carriers produce higher reverse bias current

fractional change in minority carriers produce higher forward bias current

fractional change in minority carriers produce higher reverse bias current

Answer and worked solution

Official answer: D

Reverse bias. The reverse current is carried by minority carriers. Light changes the minority-carrier density by a large fraction, so the change in reverse current is easy to detect; the same change barely affects the much larger forward (majority-carrier) current.

(D)

Topics:Special diodes (LED, Zener, photodiode, solar cell)

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JEE Main 2022 · 25 Jun · Shift 1, Physics question 47