A solid at temperature T1 is kept in an evacuated chamber at temperature T2> T1.
A solid at temperature T1 is kept in an evacuated chamber at temperature T2> T1. The rate of increase of temperature of the body is proportional to
(a) T2 - T1
(b) T22 - T21
(c) T32 - T31
(d) T42 - T41
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