A body cools in a surrounding of constant temperature `30^@C` Its heat capacity is `2 J//^(@)C`. Initial temeprature of cooling is valid. The body cools to `38^@C` in 10 min
When the body temperature has reached `38^@C`, it is heated again so that it reches `40^@C` in 10 min. The heat required from a heater by the body is

Options

A. 3.6 J
B. 0.364 J
C. 8 J
D. 4 J

Answer

C

Explanation

During heating process from `38^@C` to `40^@C` in 10 min, the body will lose heat in the surrounding which will be sxactly equal to the heat lost when it cooled from `40^@C` to `38^@C` in 10 min, which is equal to `msDeltatheta=2xx2=4J`.
During heating process heat required by the body `ms=Deltatheta=4J`.