Semiconducting Devices Question 19
Question: Assertion : The current gain in common base circuit is always less than one. Reason : At constant collector voltage the change in collector current is more than the change in emitter current.
Options:
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.
E) If assertion is false but reason is true.
Show Answer
Answer:
Correct Answer: C
Solution:
The current gain in common base circuit $ \alpha ={{( \frac{\Delta I _{C}}{\Delta I _{E}} )} _{V _{C}}} $ .
The change in collector current is always less than the change in emitter current.
$ \Delta I _{C}<\Delta I _{E} $ .
Therefore , $ \alpha <1.
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