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

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Both Assertion and Reason are incorrect

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Solution

The correct option is B Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
Forward bias is always kept small as compared to the reverse bias. This is because if forward bias is kept large, majority carriers in the emitter drift towards the collector through the base region with large velocity creating large amount of heat which may break covalent bonds and thus spoil the transistor. So, to keep low forward bias, low input impedance is used.
So, reason is unassignable, option (b) is right.

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