Question

Figure shows a qualitative plot of current vs potential difference for a p-n junction. Which of the following is true regarding the above graph.

• A. Junction offer a little resistance if we try to pass an electric current from p-side to the n-side
• B. Junction offer a high resistance if we try to pass an electric current from n-side to p-side
• C. The device which allows current in both the direction ( forward as well as backward ) is called as Ideal junction or diode
• D. Both A and B

Answer 1

The correct option is D Both A and B

In forward bias, the depletion layer is thin and thus the resistance offered to the electric current, passing from p side to n side, is small.

In reverse bias, the depletion layer becomes thick and thus the resistance offered to the electric current, passing from n side to p side, is large.
An ideal diode is one which offers infinite resistance in reverse bias, and zero resistance in forward bias.