In the feedback system in Figure E.22, graph the response of the system to a unit step, for the time period, 0 < t < 10, then write the expression for the overall system transfer function and draw a pole-zero diagram, for the given values of K.
(a) K = 20
(b) K = 10
(c) K = 1
(d) K = ?1
(e) K = ?10
(f ) K = ?20
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