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A three phase 50 Hz, 400 kV transmission line is 300 km long. The line inductance is 0.97 mH/km per phase and capacitance is 0.0115 mF/km per phase. Assume a loss less line. Determine the line wavelength (a line phase constant). 

(A) 1250 km (B) 6578 km (C) 4990 km (D) 2445 km 

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