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JEE Main 2014 Physics question

PhysicsThermal Properties of MatterJEE Main 2014

Water of volume 2 L in a closed container is heated with a coil of 1 kW. While water is heated, the container loses energy at a rate of 160 J/s. In how much time will the temperature of water rise from 27 °C to 77 °C ? (Specific heat of water is 4.2 kJ/kg and that of the container is negligible).

Answer: (1)

Solution

Heat needed J. The net power available for

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Question ID VK-104353