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Chapter 20: Problem 5

In forward bias, the width of potential barrier in a \(P-N\) junction diode (A) Increases (B) Decreases (C) Remains constant (D) First increases then decreases

Short Answer

Expert verified
In forward bias, the width of the potential barrier in a P-N junction diode decreases as the positive charge on the P side and the negative charge on the N side reduce the potential difference, allowing higher current flow. So, the correct answer is (B) Decreases.

Step by step solution

01

Understand P-N junction diode and forward bias

In a P-N junction diode, the potential barrier is the voltage difference that exists between the P (positive) and N (negative) regions of the diode. Under forward bias, the external voltage is connected such that the positive terminal is connected to the P side and the negative terminal is connected to the N side. Forward bias helps the P and the N sides of the diode to have a lower potential difference, which allows the flow of current.
02

Effect of forward bias on potential barrier width

When the diode is under forward bias, the positive charge on the P side and the negative charge on the N side cause the potential barrier to decrease. As the potential barrier decreases, the width of the depletion region (the region with no majority charge carriers) also decreases. This causes the P-N junction resistance to decrease, allowing a higher flow of current.
03

Identify the correct answer

Based on the explanation above, when a P-N junction diode is under forward bias, the width of the potential barrier decreases. Therefore, the correct answer is: (B) Decreases

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Most popular questions from this chapter

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Symbolic representation of photodiode is
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