An amplifier without feedback has a voltage gain of 50,input resistance os 1 KΩ & Output resistance of 2.5KΩ.The input resistance of the current-shunt negative feedback amplifier using the above amplifier with a feedback factor of 0.2 is___________?
(A) 1/11KΩ
(B) 1/5KΩ
(C) 5KΩ
(D) 11KΩ
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