The circuit output measures -2 V and Vin is 0.2 V; the magnitude of the closed-loop gain is

The circuit output measures -2 V and Vin is 0.2 V; the magnitude of the closed-loop gain is

• A. 5
• B. 15
• C. 20
• D. 10

Answer: (D)

The closed-loop gain magnitude is the absolute value of the output divided by the input: |Vout/Vin|. Here Vout = -2 V and Vin = 0.2 V, so Vout/Vin = -2 / 0.2 = -10. The negative sign shows the output is inverted relative to the input, while the magnitude is 10. So the magnitude of the closed-loop gain is 10.

The closed-loop gain magnitude is the absolute value of the output divided by the input: |Vout/Vin|. Here Vout = -2 V and Vin = 0.2 V, so Vout/Vin = -2 / 0.2 = -10. The negative sign shows the output is inverted relative to the input, while the magnitude is 10. So the magnitude of the closed-loop gain is 10.