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According to Nyquist stability criterion, where should be the position of all zeros of q(s) corresponding to s-plane?

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According to Nyquist stability criterion, where should be the position of all zeros of q(s) corresponding to s-plane?

(a) On left half

(b) At the center

(c) On right half

(d) Random

I have been asked this question during an interview for a job.

I would like to ask this question from Nyquist Stability Criterion topic in division Stability in Frequency Domain of Control Systems

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Correct answer is (a) On left half

Easiest explanation: According to Nyquist stability criterion zeroes must lie on the left half on the s plane.

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