A coil takes 15 minutes to boil a certain amount of water. Another coil takes 20 minutes for the same process. Time taken to boil the same amount of water when both coils are connected in series is
Text Solution
Verified by ExpertsThe correct answer is:
C
From Joule's law,
Where V is potential difference, t is the time and R is the resistance.
Let 
constant 
and 
minutes
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