Question

Consider an $n-p-n$ transistor with its base-emitter junction forward biased and collector-base junction reverse biased. Which of the following statements are true?

• A. Electrons cross over from emitter to collector.
• B. Holes move from base to collector.
• C. Electrons move from emitter to base.
• D. Electrons from the emitter move out of base without going to the collector.

Answer 1

Answer: (A), (C)

Electrons move from emitter to base.

In an $n-p-n\text{transistor}$,

As the emitter$\left(n\right)-$base$\left(p\right)$ is forward biased, the electrons move from emitter to base.

Also, As the collector$\left(n\right)-$base$\left(p\right)$ is reverse biased and electrons, which are not combined with holes in base region, crosses to collector side.

Hence, options $\left(A\right)\text{and}\left(C\right)$ are correct.

Why this Question? Key idea - This question tests your basic understanding of a transistor.