# Operational Amplifier Fundamentals – 87

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87. Calculate the input voltage if R1 = 100 Ω, Rf = 1 kΩ, and Vout = 550 mV.

(a) –50 mV
(b) –5 mV
(c) 550 mV
(d) 50 mV

Explanation
Explanation : No answer description available for this question. Let us discuss.
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