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Assertion : A transistor amplifier in ...

Assertion : A transistor amplifier in common emitter configuration has a low input impedence.
Reason : The base to emitter region is forward biased.

A

If both assertion and reason are true and the reason is the correct explanation of the assertion.

B

If both assertion and reason are true but reason is not the correct explanation of the assertion.

C

If assertion is true but reason is false.

D

If the assertion and reason both are false.

Text Solution

Verified by Experts

The correct Answer is:
A
Input impedance of common emitter configuration `=|(DeltaV_(BE))/(Deltai_(B))|_(V_(CE)="constant")` where `DeltaV_(BE)` = Voltage across base and emitter (base emitter region is forward biased) `Deltai_(B)` = Base current which is of the order of few micro-amperes.
Thus, input impedance of common emitter is low.
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