An n-p-n transistor can be considered to be equivalent to two diodes, connected. Which of the following figures is the CORRECT ONE?

CONCEPT:

• Forward Biased PN Junction Diode: When a diode is connected in a Forward Bias condition, a negative voltage is applied to the N-type material and a positive voltage is applied to the P-type material.

• So, p-n junction diode is represented by a given figure. (p-n = positive-negative or anode-cathode)

• n-p junction: When a diode is connected in such a way that a negative voltage is applied to the p-type material and a positive voltage is applied to the n-type material. (Just opposite of p-n junction.)

EXPLANATION:

• In an n-p-n transistor, there are two junctions n-p junction and p-n junction.
• So the left side of the base will be an n-p junction and the right side of the base will be a p-n junction.
• So, npn transistor = opposite pn diode and pn diode.
• And this is shown in option 2.
• So the correct answer is option 2.