Chapter 14, Problem 14.4EP

An op−amp with an open−loop gain of $A_{OL}={10}^5$ is used in a noninverting amplifier configuration with a closed−loop gain of $A_{CL}=100$ . Determinethe closed−loop output resistance $R_{of}$ for: (a) $R_o=100\Omega$ , and (b) $R_o=10\text{k}\Omega$ .(Ans. (a) $R_{of}=0.1\Omega$ (b) $R_{of}=10\Omega$ )