If the radius and length of a copper rod...

If the radius and length of a copper rod are both doubled, the rate of flow of heat along the rod increases

4 times

2 times

8 times

16 times

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The ends of two rods of different materials with their thermal conductivities, radii of cross sections and lengths all in the ratio 1 : 2 are maintained at the same temperature difference, if the rate of flow of heat in the larger rod is 4 cal/ sec, the rate of flow of heat in the shorter rod will be

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CHETAN PUBLICATION-HEAT-Choose and write the correct option:

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