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

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°
Answer» C. 180°-45°