The input impedance of op-amp circuit of figure is

1. 

The input impedance of op-amp circuit of figure is

313-188-1
[A]. 120 k ohm
[B]. 110 k ohm
[C]. infinity
[D]. 10 k ohm

Answer: Option D

Explanation:

Due to the presence of virtual ground at input, the resistance in the series path of input of inverting amplifier is input impedance.

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