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 :

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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.	t-45
B.	t45
C.	t180 -45
D.	t180 +45
Answer» C. t180 -45

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