Discussion
Its open-loop output impedance was \( 500 \ \Omega \). With the same feedback it becomes
Answer: C
Voltage sampling divides the output impedance by the same factor:
\[ Z_{of} = \frac{500}{11} \approx 45 \ \Omega \]
giving about 45 ohms. Multiplying instead gives 5.5 kilohms, which is what current sampling would produce. One factor, applied as a multiplication at one port and a division at the other, covers the whole impedance behaviour of a topology once its two words are read.
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