System has phase margin φPM = 45°. The damping ratio ξ

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System has phase margin φPM = 45°. The damping ratio ξ is—

1. 1
2. 0.5
3. 0
4. 0.42

Correct Option: D

Given, φ_PM = 45°
ξ = ?

ξ =	tan φ_PM√cos φ_PM
	2

=	tan 45°√cos 45°
	2