Input impedance of a system is 50 Ω, for the system to be negative feedback, w

Question

Input impedance of a system is 50 Ω, for the system to be negative feedback, which of the following can be its input impedance without feedback?

Options:

A . 50 Ω

B . 60 Ω

C . 40 Ω

D . 100 Ω

Answer: Option C
Answer: (c).40 Ω

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