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Chapter 19: Problem 2617

In forward bias made, the PN junction diode resistance will (A) infinity (B) zero (C) less (D) more

Short Answer

Expert verified
In forward bias mode, a PN junction diode allows the current to flow through it with minimal resistance. While the resistance is not zero, it is less than the resistance in reverse bias mode. Therefore, the correct answer is (C) less.

Step by step solution

01

Understanding PN Junction Diode in Forward Bias Mode

A PN junction diode is made up of two semiconductor materials, P-type and N-type. In a forward bias mode, the P-side of the diode is connected to the positive terminal of the battery, and the N-side is connected to the negative terminal. This connection allows the electrons in the N-side to flow towards the P-side, which results in current flow through the diode.
02

Resistance in Forward Bias Mode

In forward bias mode, the diode allows the current to flow through it with minimal resistance. The resistance is not zero, as there is still some opposition to the flow of current due to the depletion region, but it is less than the resistance in reverse bias mode, where the diode does not allow the current to flow through it.
03

Choosing the Correct Option

Based on the understanding of PN junction diode in forward bias mode and its resistance, we can choose the correct option among the given ones: (A) infinity - Incorrect, as the resistance is not infinitely high in forward bias mode. (B) zero - Incorrect, as there is still some opposition to the flow of current, even if minimal. (C) less - Correct, as the resistance in forward bias mode is less than in reverse bias mode. (D) more - Incorrect, as the resistance is not higher in forward bias mode compared to reverse bias mode. So, the correct answer is (C) less.

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