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Discussion :: Analog Electronics

  1. The input impedance of op-amp circuit of figure is

    2. A.
    120 k ohm
    B.
    110 k ohm
    C.
    infinity
    D.
    10 k ohm

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    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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