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Working with rods of different thermal conductivities

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Which of the following cylindrical rods of the same material with its ends at the same steady difference of temperature will conduct maximum heat ?

1. Lenght 100 cm & radius 1 cm

2. length 200 cm & radius 1 cm

3. length 400 cm & radius 2 cm

4. length 100 cm & radius 2 cm

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Very detail answer with easy to understand steps. It will enable you to do similar problems yourself.

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We have, the quantity of heat conducted

Q = K A (t1 - t2)/d

(t1 - t2) is the temperature difference existing ...

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