The ratio of two cylindrical rods of same material

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Text Solution

`1 : 1` `1 : 8` `2 : 1` `8 : 1`

Answer : B

Solution : Rate of heat flow `= R = dQ//dt = KA (T_(1) - T_(2)//lR prop A//l, R prop D^(2)//l, R_(1)//R_(2) = (D_(1)^(2)//D_(2)^(2))xx (l_(2)//l_(1))` <br> `R_(1)//R_(2) = (1//4) xx (1//2) = 1//8`