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NEET2004PhysicsSemiconductorsActual

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

Options

  1. AIf both assertion and reason are true and reason is the correct explanation of assertion
  2. BIf both assertion and reason are true but reason is not the correct explanation of assertion
  3. CIf assertion is true but reason is false
  4. DIf both assertion and reason are false.

Correct answer

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

Step-by-step solution

Input impedance of common emitter configuration = . V_ B E i_B |_ V_ C E = constant where V_ B E = voltage across base and emitter, i_B= base current which is order of few microampere. Thus input impedance of common emitter is low.

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