Discussion
When Op-Amp is used as an integrator, the feedback element is
Answer: B
An op-amp integrator has a resistor in series with the inverting input and a capacitor as the feedback element, so the output is proportional to the time integral of the input: Vo = -(1/RC) ∫ Vin dt. A resistor in the feedback gives an inverting amplifier, a Zener diode in the feedback path gives a clipping or reference circuit, and a voltage divider is not a feedback element that integrates. The answer is the capacitor, option B.
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