Question:
When a PN junction diode is forward biased, the CORRECT statement is
When a PN junction diode is forward biased, the CORRECT statement is
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Forward bias = Narrow depletion layer = Low resistance = High current.
Reverse bias = Wide depletion layer = High resistance = Low current.
Reverse bias = Wide depletion layer = High resistance = Low current.
Updated On: Jun 26, 2026
- the majority carrier current is zero
- the junction resistance is large
- the width of depletion layer is reduced
- the width of depletion layer is increased
- the minority carrier current is large
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The Correct Option is C
Solution and Explanation
Step 1: Understanding the Concept:
Forward biasing means connecting the P-side to the positive terminal and the N-side to the negative terminal of a battery.
Step 2: Detailed Explanation:
1. Electric Field: The external battery voltage opposes the built-in barrier potential of the junction.
2. Charge Carrier Movement: Majority carriers (holes from P and electrons from N) are pushed towards the junction.
3. Depletion Layer: As carriers enter the depletion region, the width of the region (where no free carriers exist) decreases.
4. Result: Resistance decreases significantly, and a large majority carrier current flows.
Step 3: Final Answer:
The correct statement is that the width of the depletion layer is reduced.
Forward biasing means connecting the P-side to the positive terminal and the N-side to the negative terminal of a battery.
Step 2: Detailed Explanation:
1. Electric Field: The external battery voltage opposes the built-in barrier potential of the junction.
2. Charge Carrier Movement: Majority carriers (holes from P and electrons from N) are pushed towards the junction.
3. Depletion Layer: As carriers enter the depletion region, the width of the region (where no free carriers exist) decreases.
4. Result: Resistance decreases significantly, and a large majority carrier current flows.
Step 3: Final Answer:
The correct statement is that the width of the depletion layer is reduced.
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