A reverse biased PN junction will act as a/ana.Attenuatorb.Amplifierc.Closed switchd.Open switch

Analysis of Reverse-Biased PN Junction

A reverse-biased PN junction is formed when the p-type material is connected to the negative terminal of the power supply and the n-type material to the positive terminal. This configuration affects the behavior of the junction significantly.

1. Behavior Under Reverse Bias:

   • In reverse bias, the electric field widens the depletion region, and only a very small leakage current flows. This means that the junction does not conduct current effectively.

2. Functionality:

   • Given this lack of conduction, the reverse-biased PN junction does not allow current to flow, behaving similarly to an open switch. Thus, it essentially prevents current flow through the junction under normal conditions.

Final Answer

The correct answer is d. Open switch.