Two rods of lengths L1 and L2 are made o...

Two rods of lengths `L_1` and `L_2` are made of materials having coefficients of linear expansion `alpha_1` and `alpha_2` respectively. If `(L_1- L_2)` is independent of temperature which of the following relations is correct?

A. `L_1L_2=alpha_1/alpha_2`

B. `L_1L_2=alpha_1alpha_2`

C.`L_1alpha_1=L_2alpha_2`

D. none of these

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