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For useful amplifying action, which of the following features should a transistor have ?

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The emitter should be heavily doped, the collector less heavily doped and the base lightly doped.

The area of the base-collector junction must be larger than that of the emitter-base junction.

The thickness of the base layer should be very small.

All the above features.

answer is D.

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Detailed Solution

Any transistor the emitter is meant for supplying the charge carriers while the charge carriers shouldn’t be last good in the base so the base should be thin.

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