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78. The coefficient of linear expansion of brass and steel are

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)   a1l2-a2l1                                     (b)  a1l2 2-a2l1 2

(c)  a1  2 l1 -a2  2 l2                            (d) a1l1-a2l2

Answer-d

(9)

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