AIIMS 2018 Physics Transistor Circuits Assertion Reason 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.
If both assertion and reason are true and reason is the correct explanation of assertion.
If both assertion and reason are true but reason is not the correct explanation of assertion.
If assertion is true but reason is false.
If both assertion and reason are false.
Correct Answer
Detailed Explanation
In a common base configuration, the current gain (α) is defined as the ratio of the change in collector current (ΔI_C) to the change in emitter current (ΔI_E), and it is always less than one (α < 1) because ΔI_C is always less than ΔI_E due to the transistor's operation. The reason provided is true as it correctly states that at a constant collector voltage, the change in collector current is less than the change in emitter current, thus supporting the assertion. Options B, C, and D are incorrect because they either misinterpret the relationship between collector and emitter currents or incorrectly assert the truth of one or both statements.
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