Given coefficient at linear expansion for brass = 18 × 10-6 / C and that for iron (a) = 12 * 10-6 /°C, what length of brass (l) and iron (4) should be taken so that the difference between them may always remain 0.1 m for any variation in temperature ?
(1) l = 0.3 m, 4 = 0.4 m
(2) 4 -0.4 m, 4 = 0.3 m
(3) 1 = 0.2 m, 4 = 0.3 m
(4) 4 - 0.3 m, 4 -0.2 m
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