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A 200 V dc genrator sends electrical ene...

A 200 V dc genrator sends electrical energy to a distant factory through a 10km long wire . Resistance of the wire per km is `0.04Omega` .If tranmission line current is 150A , what is the efficiency of supplied energy ? If this amount of energy is tranmiited through 500V , find the change in efficiency ?

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The correct Answer is:
70 % , increase by 36 %
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