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Q.

The ratio of radii of two cylindrical rods of same material is 2 :1 and ratio of their lengths is 2 : 3. Their ends are maintained at same temperature difference. If rate of flow of heat in the longer rod is 2 Cal s-1, then that in the shorter rod will be

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a

4 Cal s-1

b

12 Cal s-1

c

8 Cal s-1

d

1 Cal s-1

answer is B.

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The ratio of radii of two cylindrical rods of same material is 2 :1 and ratio of their lengths is 2 : 3. Their ends are maintained at same temperature difference. If rate of flow of heat in the longer rod is 2 Cal s-1, then that in the shorter rod will be