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Q.

A heater coil rated at 1000W is connected to a 110V mains. How much time will take to melt 625 gm of ice at 0ºC. (for ice L= 80 cal/gm)

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a

100s

b

200s

c

150s

d

210s

answer is D.

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Detailed Solution

detailed_solution_thumbnail

Pt=JmL;t=JmLP=4.2×625×801000=210 s

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