Question

When forward bias is applied to a p-n junction, then the potential barrier and the width of the depletion region respectively.

• A. increases, increases.
• B. decreases, increases.
• C. increases, decreases.
• D. decreases, decreases.

Hint:

Forward bias opposes the built-in field of the junction, so the barrier shrinks and the depletion layer narrows.

Answer 1

The Correct Option is D

Step 1: Reverse thinking
In reverse bias the barrier and the depletion width both increase.

Step 2: Forward bias is the opposite
Forward bias does the reverse, so both quantities must decrease.

Step 3: Match the option
Only the option 'decreases, decreases' fits.

Final Answer:
Under forward bias the barrier height and the depletion width both reduce. \[ \boxed{\text{(D) }\text{decreases, decreases.}} \]