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A sphere, a cube and a thin circular plate, all of same material and same mass are initially heated i.e.,same high temperature; then:

a
plate will cool fastest and cube the slowest.
b
sphere will cool fastest and cube the slowest.
c
plate will cool fastest and sphere the slowest.
d
cube will cool fastest and plate the slowest.

detailed solution

Correct option is C

Cooling rate ∞ Area

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