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Determine $\mathrm{V}_0$ / Vin for the circuit shown below.
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Solution:

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Ans:- By virtual ground concept,

$ V_A=V_B=0 $

enter image description here

Therefore circuit can be modified as -

$ \therefore \frac{\nu_0}{v_{i n}}=\frac{-\left[\left[R_2 \| R_3\right]+R_4\right]}{R_1} $

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