The co-efficient of thermal expansion of...

The co-efficient of thermal expansion of a rod is temperature dependent and is given by the formula `alpha = aT`, where `a` is a positive constant at T `"in"^(@)C`. if the length of the rod is l at temperature `0^(@)C`, then the temperature at which the length will be `2l` is

`10^(@)C`

`20^(@)C`

`200^(@)C`

`100^(@)C`

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