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MCQ Practice Question

Electronic Devices & Circuits Operational Amplifiers

For an ideal op-amp operating with negative feedback in its linear region, the differential input voltage V+ – V- is approximately?

AInfinite
BEqual to the supply voltage
CZero
DAlways 1 V

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Correct Answer: C. Zero

Explanation: Because an ideal op-amp has infinite open-loop gain, linear negative-feedback operation forces its two input voltages to be approximately equal, often called a virtual short.

Reference: Standard analog electronics: ideal op-amp assumptions

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