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Two heating coils A and B are used to heat water When coil A is...

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Two heating coils A and B are used to heat water When coil A is supplied a constant voltage V it heats 1 kg water from 20 C to 60 C in 10 minutes When coil B is supplied a constant voltage V it heats 1 kg water from 20 C to 80 C in 5 minutes Now the coils are connected in series and the combination is supplied a constant voltage V The temperature starting from 20 C to which the coils heat 1 kg of water in 15 minutes is C Assume that water is heated in insulated vessels such that the heat loss to the surroundings is negligible

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