Question

If a p–n junction diode is reverse biased then

• A. potential barrier decreases
• B. width of the depletion layer decreases
• C. electrical conduction is possible
• D. width of the depletion layer increases

Hint:

Reverse bias always widens the depletion region and reduces current.

Answer 1

The Correct Option is D

Step 1: Meaning of reverse bias.
In reverse bias, p-side is connected to the negative terminal and n-side to the positive terminal of the battery.
Step 2: Effect on depletion layer.
The applied electric field adds to the junction field, pulling majority carriers away from the junction.
Step 3: Resulting effect.
This increases the width of the depletion layer and raises the potential barrier.
Step 4: Conclusion.
Hence, the width of the depletion layer increases.