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Analog circuits miscellaneous

  1. Magnitude of the gain in the inverting op-amp amplifier circuit shown in the figure be x with switch S1 open. When switch S1 is closed, then magnitude of gain becomes

    1. x
      2

    2. – x
    3. 2x
    4. – 2x
Correct Option: A

Vo
= A =
-2R
= -2 = x
ViR

When switch S1 is closed,
A =
-R
= -1 =
x
R2



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