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  • It takes 16 min to boil some water in an electric kettle. Due to some defect it becomes necessary to remove 10% turns of heating coil of the kettle. After repairs, how much time will it take to boi

It takes 16 min to boil some water in an electric kettle. Due to some defect it becomes necessary to remove 10% turns of heating coil of the kettle. After repairs, how much time will it take to boil the same mass of water?

Option: 1

17.7 min


Option: 2

14.4 min


Option: 3

20.9 min


Option: 4

13.9 min


Answers (1)

best_answer

We have \mathrm{\frac{V^2}{R} \times 16=H\quad\quad\quad\quad\quad \quad[\because \mathrm{H}=\mathrm{P} \times \mathrm{t}]}

\frac{\mathrm{V}^2}{0.9 \mathrm{R}} \times \mathrm{t}=\mathrm{H} \Rightarrow \frac{\mathrm{V}^2}{\mathrm{R}} \times 16=\frac{\mathrm{V}^2}{0.9 \mathrm{R}} \times \mathrm{t}

Time, \mathrm{t}=16 \times 0.9=14.4 \mathrm{~min}

Posted by

shivangi.bhatnagar

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