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MHT CET 2024 (4 May, Shift 1) · Heat Conduction

Heat Conduction question from MHT CET 2024 (4 May, Shift 1)

Q21MHT CET 2024 · 4 MAY · SHIFT 1Medium

Heat Conduction

Two rods of same length \& material transfer a given amount of heat in 12 s when they are joined end to end. But when they are joined length wise parallel to each other they will transfer same amount of heat in same condition in time

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Answer: (b)

Each rod has resistance $R$ . End to end (series): $2R$ . Side by side (parallel): $\frac{R}{2}$ .
Time $\propto$ resistance, so the time drops by a factor of 4.
$t = \frac{12}{4} = 3\ \text{s}$ , so the answer is (b).

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