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How many PN junctions is/are present in a bipolar junction transistor?

How many PN junctions is/are present in a bipolar junction transistor? Correct Answer 2

A bipolar junction transistor (BJT) contains 2 PN junctions. If the transistor is NPN type then it contains a P-type semiconductor sandwiched between two N-type semiconductor. If the transistor is PNP type then it contains a N-type semiconductor sandwiched between two P-type semiconductor. In both the cases there are two PN junctions.

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