Q. (a) Two amplifiers, which can be represented by the model of Figure of the text, are connected in cascade (that is, head to tail), as shown in Figure. Let their parameters be R_{i1}, R_{o1}, A_{1}, and R_{i2}, R_{o2}, A_{2}, respectively. Find v_{x} /v_{1}.
(b) Discuss how the answer is influenced by the ratio R_{i2}/R_{o1}, particularly when this ratio approaches zero or infinity.