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Which of the equations below expresses the voltage gain relationship for an operational amplifier?

Vout = Vin/Av
Vout/Vin = Rout/Rin
Vin/Vout = Rout/Rin
Vout/Vin = –Rf/Rin

Correct Answer: Vout/Vin = –Rf/Rin

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