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Heat is flowing through two cylindrical rods made of same materials whose ends are maintained at similar temperature. If diameters of the rods are in ratio `1:2` and lengths in ratio `2:1`, then the ratio of thermal current through them in steady state is:

A

`1:8`

B

`1:4`

C

`1:6`

D

`4:1`

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The correct Answer is:
A
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