A polar plot intersects the unit circle at a point making -45° to the negative real axis then the phase margin of the system is :(a) -45°(b) 45°(c) 180°-45°(d) 180°+45°This question was addressed to me in an online interview.My doubt stems from Closed-Loop Frequency Response topic in section Stability in Frequency Domain of Control Systems

A polar plot intersects the unit circle at a point making -45° to the

1.	A polar plot intersects the unit circle at a point making -45° to the negative real axis then the phase margin of the system is :(a) -45°(b) 45°(c) 180°-45°(d) 180°+45°This question was addressed to me in an online interview.My doubt stems from Closed-Loop Frequency Response topic in section Stability in Frequency Domain of Control Systems
Answer» The correct CHOICE is (b) 45° The EXPLANATION: As the angle is with the negative REAL axis HENCE the Phase MARGIN will be 45°.

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