Question

If a diode is forward biased, then the

• A. p-n junction provides very low resistance
• B. width of the depletion layer increases
• C. potential barrier increases
• D. amount of current flow is in the range of microampere
• E. current flow is due to minority carriers only

Hint:

Forward bias: low resistance, high current. Reverse bias: high resistance, low (leakage) current.

Answer 1

The Correct Option is A

Step 1: Understanding the Concept:
Forward bias reduces the depletion layer width and lowers the potential barrier, allowing majority carriers to flow easily.

Step 2: Detailed Explanation:
In forward bias, the positive terminal of the battery is connected to the p-side and the negative terminal to the n-side. This reduces the depletion layer width and the potential barrier, making it easy for majority carriers to cross the junction. The resistance of the p-n junction becomes very low (order of ohms), and a large current (milliamperes) flows due to majority carriers.
• (A) Correct: Very low resistance.
• (B) Incorrect: Depletion width decreases.
• (C) Incorrect: Potential barrier decreases.
• (D) Incorrect: Current is in milliamperes, not microamperes.
• (E) Incorrect: Current is due to majority carriers.

Step 3: Final Answer:
In forward bias, the p-n junction provides very low resistance.