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Q.

A rod of length 40 cm has the coefficient of linear expansion α1=6×10−6/∘C. The other rod has coefficient of linear expansion, α2=4×10−6/∘C. If the difference in their length at all temperature remains the same, the length of the other rod is :

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a

26 cm

b

32 cm

c

60 cm

d

80 cm

answer is C.

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Detailed Solution

If the difference in the lengths ofthe rods remain constant.

l1α1=l2α2

I2=60cm

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