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The coefficient of linear expansion of brass and steel are α1 and α2. If we take a brass rod of length l1 and steel rod of length l2 at 0°C, their difference in length l2-l1 will remain the same at a temperature if

(a) α1l2=α2l1                                   (b) α1l22=α2l12

(c) α12l1=α22l2                                   (d) α1l1=α2l2