Multiple choice

An amplifier without feedback has a voltage gain of 50, input resistance of 1 K$\Omega$ and output resistance of 2.5 K$\Omega$. The input resistance of the current-shunt negative feedback amplifier using the above amplifier with a feedback factor of 0.2, is

  1. $\dfrac{1}{11}$ K$\Omega$
  2. $\dfrac{1}{5}$ K$\Omega$
  3. 5 K$\Omega$
  4. 11 K$\Omega$
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Explanation