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  4. A sphere, a cube and a thin circular plate, all made of the same material and having the same mass, are initially heated to a temperature of 200°C. When left in air at room temperature, the following cools fastest.

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Q. A sphere, a cube and a thin circular plate, all made of the same material and having the same mass, are initially heated to a temperature of 200°C. When left in air at room temperature, the following cools fastest.

WBJEEWBJEE 2016

Solution:

$ \frac{dT}{dt}\propto$ Surface Area for given mass.