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REMYA........Friday, October 2, 2009. Effect Of Adding Zero:Answer4. EFFECTS OF ADDING A ZERO ON THE ROOT LOCUS FOR A SECOND-ORDER SYSTEM. We can put the zero at three different positions with respect to the poles:. 1 To the right of s = –p1. 2 Between s = –p2 and s = –p1. 3 To the left of s = –p2. We now discuss the effect of changing the gain K on the position of closed-loop poles. And type of responses. A) The zero s = –z1 is not present. Critically damped or underdamped. Since the time response will become slower.
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