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Two identical long, solid cylinders are used to conduct heat from temp $T_{1} to temp T_{2}$ . Originally the cylinders are connected in series and the rate of heat transfer is H. If the cylinders are connected in parallel then the rate of heat transfer would be

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$\frac{H}{4}$

answer is C.

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Detailed Solution

Initially effective resistance = 2R. In parallel effective resistance = $\frac{R}{2}$ . It has reduced by a factor of $\frac{1}{4}$ so rate of heat transfer would be increased by a factor of 4, keeping other parameters same.

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