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One way in which the operation of a n-p-n transistor differs from that of a p-n-p transistor is:

1. The emitter junction is reversed biased in n-p-n
2. The emitter junction injects minority carriers into the base region of the p-n-p
3. The emitter injects holes into the base of the p-n-p and electrons into the base region of n-p-n
4. The emitter injects holes into the base of n-p-n

Correct answer: The emitter injects holes into the base of the p-n-p and electrons into the base region of n-p-n

Solution

In an n-p-n transistor, the emitter injects electrons (majority carriers) into the base, while in a p-n-p transistor, the emitter injects holes (majority carriers) into the base. This is a fundamental difference in their operation.

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