Q. A coil of wire of resistance is embedded in a block of ice and a potential difference of is applied across it. The amount of ice which melts in second is [latent heat of fusion of ice = ]

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A

B

C

D

Solution:

Heat energy of melting is provided by electric energy. Therefore,
, where represents mass of ice, latent heat of ice, voltage across resistance, resistance and time respectively.
On substituting all the corresponding values in the above relation, we have

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