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Two 10.0 m long iron rails are separated by 1.0 cm. The value of α for iron is 1×10−5/C°. If the initial temperature is 0°C, the temperature at which the rails will touch is

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a

50°C

b

100°C

c

200°C

d

10°C

answer is B.

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Detailed Solution

ΔL=LαΔθ, here ΔL=1cm

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