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For transistor action, which of the following statements is correct?

1. Base, emitter and collector regions should have same size.
2. Both emitter junction as well as the collector junction are forward biased.
3. The base region must be very thin and lightly doped.
4. Base, emitter and collector regions should have same doping concentrations.

Correct answer: The base region must be very thin and lightly doped.

Solution

For proper transistor action, the base region must be very thin and lightly doped to allow efficient transfer of charge carriers from the emitter to the collector.

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