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A cylindrical rod having temperature T(1...

A cylindrical rod having temperature `T_(1)` and `T_(2)` at its ends. The rate of flow of heat is `Q_(1) cal//sec`. If all the linear dimensions are doubled keeping temperature constant, then rate of flow of heat `Q_(2)` will be

A

`4Q_(1)`

B

`2Q_(1)`

C

`(Q_(1))/(4)`

D

`(Q_(1))/(2)`

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