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Can we interchange emitter and collector...

Can we interchange emitter and collector of a transistor? Explain.

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No, we cannot interchange emitter and collector of a transistor due to following reasons:
(i) In a transistor emitter is heavily doped and collector is comparatively lightly doped.
(ii) In a transistor, the contract area of emitter- collector junction is larger than that of emitter- base junction.
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