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MHT CET 2021 (21 Sep, Shift 2) · Heat Conduction

Heat Conduction question from MHT CET 2021 (21 Sep, Shift 2)

Q37MHT CET 2021 · 21 SEP · SHIFT 2Medium

Heat Conduction

Two rods of same length and material are joined end to end. They transfer heat in 8 second. When they are joined in parallel they transfer same amount of heat in same conditions in time

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Answer: (b)

Each rod has resistance $R$ . Series: $2R$ ; parallel: $\frac{R}{2}$ .
Time $\propto$ resistance, so the time drops by a factor of 4.
$t = \frac{8}{4} = 2\ \text{s}$ , so the answer is (b).

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