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Q.

The ratio of lengths of two rods is 1 : 2 and the ratio of coefficient of expansions is 2 : 3. The first rod is heated through 60°C. Find the temperature through which the second rod is to be heated so that its expansion is twice that of first is

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a

60°C

b

40°C

c

30°C

d

10°C

answer is B.

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