Discussion
Assertion (A): Assertion: A larger coupling capacitor improves an amplifier's high-frequency response.
Reason (R): Reason: A larger capacitance has a lower reactance at every frequency.
Select the correct answer from the options below.
Answer: A
The reason is true but the assertion is false: a coupling capacitor is in series with the signal, so its size affects only the low-frequency end and a larger one extends the response downward. The high end is set by shunt capacitances, which a bigger coupling capacitor does nothing about. Whether a capacitance is in series or in shunt decides which end of the response it governs, and applying a low-end remedy to a high-end problem is the mistake this item is built on.
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