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The cost of a two-core feeder cable, including installation is Rs (90+a) per meter and the...

The cost of a two-core feeder cable, including installation is Rs (90+a) per meter and the interest and depreciation charges are 10%. The cable is 2 km in length and cost of energy is (4p) per unit. The maximum current in the feeder is 250 A and demand is such that copper loss is equivalent to what would be produced by the full current flowing for 6 months. If the resistance of conductor is 1 cm^2 and 1 km length is 0.173 ohm. Calculate the most economical cross-sectional area.

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