Question:

Water boils in an electric kettle in 20 minutes after
being switched on. Using the same main supply,
the length of the heating element should be
………….. to …………. times of its initial length
if the water is to be boiled in 15 minutes.

(1) increased, 3/4

(2) increased, 4/3

(3) decreased, 3/4 

(4) decreased, 4/3                                                                                                                                JEE-2024

 

Solution:                

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