Assertion : In common base configuration, the current gain of the transistor is less than unity.
Reason : The collector terminal is revers biased for amplification.

Options

A. If both assertion and reason are true and reason is the correct explanation of assertion
B. If both assertion and reason are true but reason is not the correct explanation of assertion.
C. If assertion is true statement but resaon is false.
D. If both assertion and reason are false.

Answer

b

Explanation

In common base configuration input is applied between emitter and base and output is taken between collector and base. In this connection the base of the transistor is made common to both input and output terminals.
For amplification emitter terminals is forward biased and collector terminal is reverse biased. In this configuration, the current gain is ratio of change in collector current to the change in emitter current at constant collector base voltage `(V_(CB))`
`:. alpha=((DeltaI_(c ))/(DeltaI_(E)))_(VCB)`
Current gain `(alpha)` is less than unity beacuse collector current `(l_(c))` is always less than emitter current `(I_(E ))`. Hence,option (b) is correct.