One kg of water, at 20^° C, is heated in an electric kettle whose heating element has a mean (temperature averaged) resistance of 20 Ω. The rms…

One kg of water, at $\displaystyle 20^{\circ} \mathrm{C}$, is heated in an electric kettle whose heating element has a mean (temperature averaged) resistance of $\displaystyle 20 \Omega$. The rms voltage in the mains is $\displaystyle 200$ V . Ignoring heat loss from the kettle, time taken for water to evaporate fully, is close to : [Specific heat of water $\displaystyle =4200 \mathrm{~J} /\left(\mathrm{kg}{ }^{\circ} \mathrm{C}\right)$, Latent heat of water $\displaystyle =2260 \mathrm{~kJ} / \mathrm{kg}$ ]