A cylindrical rod having temperature T1,...

A cylindrical rod having temperature `T_1`, and `T_2` at its ends. The rate of flow of heat is `Q_1 (cal)/s`. If all the linear dimensions are doubled keeping temperature constant then rate of flow of heat`Q_2`, will be

`4Q_1`

`2Q_1`

`Q_1/4`

`Q_1/2`

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