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Q.

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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a

1.25 kg

b

2.25kg

c

2.50 Kg

d

2.74 kg

answer is B.

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Detailed Solution

Heat produced, H = V it∴ H=210×1⋅0×36004⋅2cal=180000calIf L be the latent heat of ice and m, the mass of melted ice, thenm L = 180000or m=180,00080g=2250g=2⋅25kg
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