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In polar plots, if a pole is added at the origin, what would be the value of the magnitude at Ω = 0?

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In polar plots, if a pole is added at the origin, what would be the value of the magnitude at Ω = 0?

(a) Zero

(b) Infinity

(c) Unity

(d) Unpredictable

The question was posed to me during an online interview.

I'd like to ask this question from Nyquist Stability Criterion topic in chapter Stability in Frequency Domain of Control Systems

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Right answer is (b) Infinity

Easiest explanation: Addition of pole causes instability to the system.

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