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An immersion type electric heater of 250...

An immersion type electric heater of `250` watts is immersed in `5 kg ` of water contained in a bucket. In how much time will the temperature water rise by `10^(@)C`? Sp heat capacity of water `1000cal kg^(-1)K^(-1)` and `J=4.1J cal ^(-1)`. Neglect heat capacity of bucket.

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