Question: The pole-zero map and the Nyquist plot of the loop transfer function GH(s) of a feedback system are shown below. For this (a) both open

The pole-zero map and the Nyquist plot of the loop transfer function GH(s) of a feedback system are shown below. For this

jo 0 0 s-plane O Im GH plane Re

(a) both open loop and closed loop systems are stable.
(b) open loop system is stable but closed loop system is unstable.
(c) open loop system is unstable but closed loop system is stable.
(d) both open loop and closed loop systems are unstable.

jo 0 0 s-plane O Im GH plane Re

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