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A kettle with 2 litre water at 27^@C is ...

A kettle with 2 litre water at `27^@C` is heated by operating coil heater of power 1 kW. The heat is lost to the atmosphere at constant rate `160 J//s`, when its lid is open. In how much time will water heated to `77^@C` with the lid open ? (specific heat of water = `4.2 kJ//^@C.kg)`

A

`8 min 20 sec`

B

`6 min 2 sec`

C

`7 min`

D

`14 min`

Text Solution

Verified by Experts

The correct Answer is:
A
Net `= (Q)/(t) = 100 - 160`
`(ms Delta T)/(t) = 840`.
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