Final answer:
For an ideal amplifier, the statement that 'It has zero input impedance' is not true, as an ideal amplifier is supposed to have infinite input impedance.
Step-by-step explanation:
For an ideal amplifier, there are characteristics which are hypothetical and not attainable in real-world devices. Here, we'll discuss the attributes of an ideal amplifier and identify which statements are not true:
- It has infinite bandwidth: This is typically considered a characteristic of an ideal amplifier. It means that the amplifier can amplify signals of any frequency without loss.
- It has zero input impedance: This is not true. An ideal amplifier would actually have infinite input impedance to ensure that there is no loading on the source.
- It has infinite gain: An ideal amplifier is often described as having infinite gain to amplify any signal to the desired level.
- It has zero output impedance: This is true for an ideal amplifier as it allows for maximum power transfer to the load without any loss.
To summarize, the statements which are not true for an ideal amplifier are:
- B. It has zero input impedance.