17 Remember the Nyquist stability criterion Z N P where Z is

17. Remember the Nyquist stability criterion: Z N +P, where Z is the number of closed loop unstable poles, P is the number of open loop unstable poles, and N is the number of clockwise encirclements of the critical point -1-+0i. Determine whether the closed loop system is stable or not for the following transfer functions with corresponding Nyquist plots (EXPLAIN YOUR ANSWERS). If it is not stable, what is the number of unstable closed loop poles? 10 (a) L(s)

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