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In the normal working of a transistor , the emitter is forward biased and collector is reverse biased. a. Comment on the above statement . b. Can we exchange emitter and collector of a transistor ? c. Base region of a transistor is made very thin and lightly doped. Why ? d. "Eventhough the collector - base is reverse biased, the current flow takes place with out experiencing much high resistance" , Give your explanation. |
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Answer» Solution :a. The movement of electrons from emitter to collector in n-p-n and holes in p-n-p TAKES PLACE only if the connections are made with emitter FORWARD biased and collector - reverse biased . b. No c. A thin and lightly dopped base region will contain smaller NUMBER of majority charge carriers . This will reduce the recombination rate of electrons and holes whenmajority charge carriers move from emitter to collector. d The reverse potential value is higher than the forward biased potential so that the charges injected to the base region are pulled effectively to the collector region . |
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