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In the operation of an NPN transistor, the electrons cross which region?

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In the operation of an NPN transistor, the electrons cross which region?

(a) emitter region

(b) the region where there is high depletion

(c) the region where there is low depletion

(d) P type base region

I got this question in quiz.

The doubt is from The Junction Transistor topic in portion Transistor Characteristics of Electronic Devices & Circuits

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Correct answer is (d) P type base region

Easy explanation: The electrons in the emitter region are repelled by the negative terminal of the battery towards the emitter junction. The potential barrier at the junction is reduced due to forward bias and base region is very thin and lightly doped, electrons cross the P type base region.

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