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Two metal rods 1 and 2 of same lengths h...

Two metal rods 1 and 2 of same lengths have same temperature difference between their ends. Their thermal conductivities are `K_(1)` and `K_(2)` and cross sectional areas `A_(1)` and `A_(2)` respectively. If the rate of heat conduction in 1 is four times that in 2, then

A

`K_(1)A_(1)=K_(2)A_(2)`

B

`K_(1)A_(1)=4K_(2)A_(2)`

C

`K_(1)A_(1)=2K_(2)A_(2)`

D

`4K_(1)A_(1)=K_(2)A_(2)`

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