The rate of loss of heat depends on (a) the sum of temperature of the body and its surroundings ...

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The rate of loss of heat depends on
(a) the sum of temperature of the body and its surroundings
(b) the difference in temperature of the body and its surroundings
(c) the product of temperature of the body and its surroundings
(d) the ratio of temperature of the body and its surroundings
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