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Heater of an electric kettle is made of a wire of length L and diameter...

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Heater of an electric kettle is made of a wire of length L and diameter d It takes 9 minutes to raise the temperature of 0 5 kg water by 50 k this heater is replaced by a new heater having two wires of same material each of length L Diameter of two wires are 2d and 2d If the two wires are connected in parallel how much time in minutes will it take to raise the temperature of 0 5 kg by 50 k

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