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  1. For the below circuit , Input resistance Rid will be

    2. A.
    2R1
    B.
    2 R1+ R2
    C.
    2 (R1+ R2)
    D.
    Infinity

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    Answer : Option A

    Explanation :

    Rid = Vi/Ii where Ii is the current drawn from the source. Since the two input terminals of OPAMP track each other in potential therefore writing loop equation

    Vi = R1Ii+0+R1 Ii Thus Rid=2R1

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