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Option b is correct. It is false that a coupling capacitor couples an ac signal into an amplifier without disturbing its operating point.
Coupling capacitor are widely utilized in amplifiers in analog circuits. A transistor's voltage bias is essential for the amplifier to operate normally. The purpose of coupling capacitors is to keep the bias voltage being provided to a transistor's base from being impacted by the incoming AC signal. In these situations, a coupling capacitor connected in series with the signal is used to drive the transistor's base. The capacitance value must be selected to provide unimpeded propagation of the useful signal, such as voice, while excluding the DC component.
Electronic circuits use coupling capacitors to pass the desired AC signal and inhibit undesirable DC components. These undesirable DC signals are generated by electronic components or earlier phases of an electronic circuit. DC components in audio systems introduce noise into the target signal, which lowers its quality.
DC signals also have an impact on power amplifier performance and raise distortion. A coupling capacitor is coupled in series with the signal path in circuits. Both analog and digital electrical circuits use coupling capacitors. They have numerous uses in radio frequency and audio systems.
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