The characteristic equation of a feedback system is s 3

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The characteristic equation of a feedback system is s ³ + Ks ² + 5s + 10 = 0
For the system to be critically stable, the value of K should be_______

1. 1
2. 2
3. 3
4. 4

Correct Option: B

By Routh criterion

For stable system, 10 – 5K > 0
⇒ K ≤ 2