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What is the use of coupling capacitors in CE amplifier?

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What is the use of coupling capacitors in CE amplifier?

(a) blocks dc

(b) pass ac

(c) reduce distortion

(d) pass ac & blocks dc

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The above asked question is from CE Amplifier with an Emitter Resistance topic in chapter Low Frequency Transistor Amplifier Circuit of Electronic Devices & Circuits

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The correct answer is (d) pass ac & blocks dc

For explanation: In analog circuits, a coupling capacitor is used to connect two circuits such that only the AC signal from the first circuit can pass through to the next while DC is blocked. This technique helps to isolate the DC bias settings of the two coupled circuits.

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