If a given volume of water in a 220 V heater is boiled in 5 min, then how much time will it take for the same volume of water in a 110 V heater to be boiled?
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a
20 min
b
30 min
c
25 min
d
40 min
answer is A.
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Detailed Solution
H = V2t/R. When voltage is halved, the heat becomes one-fourth. Hence, time taken to heat the water becomes four times.