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Heat is being supplied at a constant rate to the sphere of ice which is melting at the rate of \( 0.1 \mathrm{gm} / \mathrm{s} \). It melts
P completely in \( 100 \mathrm{~s} \). The rate of rise of temperature
\( \mathrm{W} \) thereafter will be
(1) \( 0.4^{\circ} \mathrm{C} / \mathrm{s} \)
(2) \( 2.1^{\circ} \mathrm{C} / \mathrm{s} \)
(3) \( 3.2^{\circ} \mathrm{C} / \mathrm{s} \)
(4) \( 0.8^{\circ} \mathrm{C} / \mathrm{s} \)
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