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A coil is embedded in a block of ice placed in an insulator box. If a current of1 . 0 amp is passed through the coil by applying a potential difference of 210 V across it, the amount of ice melted in one hour is

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1.25 kg

2.25kg

2.50 Kg

2.74 kg

answer is B.

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Detailed Solution

Heat produced, H = V it
$∴ H = \frac{210 \times 1 \cdot 0 \times 3600}{4 \cdot 2} cal = 180000 cal$
If L be the latent heat of ice and m, the mass of melted ice, then
m L = 180000
or $m = \frac{180, 000}{80} g = 2250 g = 2 \cdot 25 kg$

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