Two OP AMP circuits are shown in Figure P4-21 . Both claim to produce a gain of

Question:

Two OP AMP circuits are shown in Figure P4-21
image text in transcribed . Both claim to produce a gain of either $\pm 100$.
(a) Show that the claim is true.
(b) A practical source with a series resistor of $1 \mathrm{k} \Omega$ is connected to the input of each circuit. Does the original claim still hold? If it does not, explain why.