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Grid cables are 15 km long with a resistance of 0.20 Ω km^-1 , powers wasted as heat in these cables are

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Grid cables are 15 km long with a resistance of 0.20 Ω km-1 , powers wasted as heat in these cables are 

A. 50 kW 

B. 60 kW 

C. 20 kW 

D. 30 kW

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The Correct option is  D. 30 kW

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