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Two solid spheres A and B made of the same material have radii $r_A$ and $r_B$ respectively. Both the sphere are cooled from the same temperature under the conditions valid for Newton's law of cooling. The ratio of the rate of change of temperature of A and B is :

\[\begin {array} {1 1} (a)\;\frac{r_A}{r_B} & \quad (b)\;\frac{r_B}{r_A} \\ (c)\;\frac{r^2_A}{r^2_B} & \quad (d)\;\frac{r^2_B}{r^2_A} \end {array}\]
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$(b)\;\frac{r_B}{r_A} $
answered Nov 7, 2013 by pady_1

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