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Q.

Distance between two places is 200 km. α  of steel 12×10−6/oC . Total space that must  be left between steel rails to allow for a  change of temperature from 90°C to is 100°C

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a

1.08 km

b

0.024 km

c

10.8 km

d

0.048 km

answer is B.

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Detailed Solution

l2=l1αΔt=200×12×10−6×10=24×10−3=0.024km
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