The input impedance of an op-amp is higher for inverting amplifier difference amplifier voltage follower none of the mention
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High input impedance of op-amp means it provides little power to the signal. High impedance is provided at the input of an inverting amplifier so that it gives good amplification of the signal at the output. To gain all the voltage from output, the input impedance should be high so that circuit operates at very low input current.
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