A beaker containing 1 kg of water at room temperature is heated on a 400 W hot plate. The specific heat capacity of water is $4200 \mathrm{Jkg}^{-1}\mathrm{K}^{-1}$.

A beaker containing 1 kg of water at room temperature is heated on a 400 W hot plate. The specific heat capacity of water is $4200 \mathrm{Jkg}^{-1}\mathrm{K}^{-1}$.

The temperature of the water increases until it reaches a constant value. It is then removed from the hot plate.

What will be the initial rate of change of temperature?