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Q.

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

30 min

b

25 min

c

40 min

d

20 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.

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