Question

If a p-n junction diode is forward biased, then:

• A. There will be less resistance
• B. Current is due to minority charge carriers only
• C. Barrier potential increases
• D. Width of depletion region increases

Hint:

In forward bias, the p-n junction diode’s resistance decreases, allowing current to flow easily. Remember that the majority charge carriers are responsible for current flow in forward bias.

Answer 1

The Correct Option is A

In a p-n junction diode, when it is forward biased, the p-side (positive side) is connected to the positive terminal of the power supply and the n-side (negative side) is connected to the negative terminal. This reduces the barrier potential and allows current to flow. - (A) is correct because forward bias reduces the resistance, allowing current to pass through the diode. - (B) is incorrect because in forward bias, the current is mainly due to majority charge carriers (holes from the p-side and electrons from the n-side). - (C) is incorrect because in forward bias, the barrier potential decreases, not increases. - (D) is incorrect because the width of the depletion region decreases in forward bias. - (E) is incorrect because the current is typically much larger than \(10^{-6}\) A in a forward-biased diode; it can be in the milliampere range. Thus, the correct answer is that the diode has less resistance in forward bias.