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Which two network theorems exhibit duality ?

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For a 66 kV line having span of 200 meters between towers the approximate sag will be 2 m. If the span is double the sag will be: 

(A) 1 m (B) 2 m (C) 4m (D) 8m

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For a 66 kV line having span of 200 meters between towers the approximate sag will be 2 m. If the span is double the sag will be: 8m

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