a. If the op-amp of Figure P12.61 has an open-loop gain of 45 ×10^5, find the closed-loop gain f

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a. If the op-amp of Figure P12.61 has an open-loop gain of $45 \times 10^5$, find the closed-loop gain for $R_F=R_S=7.5 \mathrm{k} \Omega$, with reference to equation 12.18. b. Repeat part a if $R_F=5\left(R_S\right)=37,500 \Omega$.