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JEE PHYSICS MCQ: THERMAL PROPERTIES OF MATTER

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The ends of 2 different materials with their thermal conductivities, radii of cross section and length all in the ratio of 1  :21\;:2 maintained at temperature difference. If the rate of the flow of heat in the longer rod is 4 cals−1{\mathrm{s}^{ - 1}}, that in the shorter rod in cals−1{\mathrm{s}^{ - 1}} will be
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Correct option: A
1
Option A (1) is correct because the rate of heat flow is directly proportional to thermal conductivity and area, and inversely proportional to length. Considering the ratios, the heat flow in the shorter rod is 1 cal/s.

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