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Question

How many pn junctions does a transistor have?


  1. 1

  2. 2

  3. 4

  4. 8


Solution

The correct option is B

2


A transistor consists of 2 pn junctions in the series of p-n-p or n-p-n. The p-type has a high hole concentration and then the n-type region has a high electron concentration. The electrons diffuse from the n-type side to the p-type side. Similarly, holes diffuse from the p-type side to the n-type side. 

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