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Sag of the conductors of a transmission line is 2 m when the span is 200 m. Now if the height of the supporting tower is increased by 25 percent sag will ____.
1. Increase by 25 percent
2. Reduce by 25 percent
3. Reduce by 12.5 percent
4. Remains unchanged

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Correct Answer - Option 4 : Remains unchanged

Concept of Sag (s):

The distance between the highest point of electric poles or towers and the lowest point of a conductor connected between two poles or towers.

Span length: It is the shortest distance between two towers or poles. 

\(S = \frac{{W{l^2}}}{{8T}}\)

Where,

S is the sag of the conductor

W is the weight of the conductor

l is the span length of the conductor

T is the working tension on the conductor

Here in the question height of the supporting towers is increased by 25 % which is independent of sag. Hence there will be no change in sag.

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