Discussion
Negative feedback for an operational amplifier leads to :
Answer: B
Negative feedback leads to an increase in the input impedance and the bandwidth.
With series (voltage) negative feedback, as in the non-inverting amplifier, the input impedance is multiplied by the factor (1 + Aβ), the output impedance is divided by the same factor, and the bandwidth is extended by it while the gain falls by it, keeping the gain-bandwidth product constant.
So the output impedance decreases rather than increases, which rules out option A; option C wrongly says the bandwidth decreases; and option D ignores the effect altogether.
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