A) If both the assertion and reason are true and reason explains the assertion.
B) If both the assertion and reason are true but reason does not explain the assertion.
C) If assertion is true but reason is false.
D) If assertion is false but reason is true. Input impedance of common emitter configuration is given by
Correct Answer: B
Solution :
\[=\left( \frac{\Delta {{V}_{BE}}}{\Delta {{l}_{B}}} \right){{V}_{CE}}=\] constant Here, \[\Delta {{V}_{BE}}=\] voltage across base and emitter \[\Delta {{l}_{B}}=\] base current of the order of few microampere. Hence, impedance of common emitter is low. In a transistor, emitter-base region should be forward biased for good amplification.
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