Discussion
Assertion (A): Assertion: The common-base configuration has the best high-frequency response of the three.
Reason (R): Reason: It has no voltage gain and therefore no Miller multiplication of capacitance.
Select the correct answer from the options below.
Answer: B
The assertion is true but the reason is wrong: common base has substantial voltage gain; what it lacks is the inverting gain from input to output across the collector-base capacitance, so there is no Miller multiplication. The input is the emitter and the capacitance in question does not bridge it. A correct conclusion resting on a wrong mechanism is the most instructive error, because it survives every check except tracing the cause. Checking the units of each quantity catches a wrong formula before the arithmetic begins.
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