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The root locus plot is symmetrical about real axis because
1. Complex root occur is conjugate pairs
2. All roots occur in pairs
3. Roots occur simultaneously in left hand and right hand plane
4. All of the above

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Correct Answer - Option 1 : Complex root occur is conjugate pairs

The root locus is a graphical representation in s-domain, and it is symmetrical about the real axis. Because the open loop poles and zeros exist in the s-domain having the values either as real or as complex conjugate pairs.

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