Determine whether the closed-loop system in Figure 9.70 is stable or not, given the loop

Chapter 0, Problem 10

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Determine whether the closed-loop system in Figure 9.70 is stable or not, given the loop transfer function L{s) = Gc{s)G{s) = '* * . s {4s + 1) In addition, if the closed-loop system is stable, compute the gain and phase margins. a. Stable, G.M. = 24dB,P.M. = 2.5 b. Stable, G.M. = 3 dB, P.M. = 24 c. Stable, G.M. = oo dB, P.M. = 60 d. Unstable

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