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Polar plots moving toward the imaginary axis makes the system:(a) Stable(b) Marginally stable(c) Conditionally stable(d) UnstableThis question was addressed to me in an internship interview.I want to ask this question from Assessment of Relative Stability Using Nyquist Criterion in chapter Stability in Frequency Domain of Control Systems

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Right ANSWER is (d) UNSTABLE

To elaborate: POLAR plots moving TOWARD the imaginary axis MAKES the system unstable.



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