The water in an electric kettle begins to boil in 10 minutes. In order to boil the water in 5 minutes the length of the heating element should be changed to
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Explanation:
In order to increase the heating time, For the same supply voltage, We should increase the length of the conductor so that it's resistance will get increased…
Since, For the same supply voltage, Increasing the resistance will decrease the current which subsequently will decrease the amount of heat produced across the resistance So that, We will need to wait for some more time to get kettle hot
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