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Q.

A metal tape gives correct measurement at 15oC. It is used to measure a distance of 100m at 450  c  0. The error in the measurement, if α = 12 x 10-6 /1oC is

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a

36 cm

b

36 m

c

42 mm

d

36 mm

answer is D.

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Detailed Solution

Error = αl(t2 - t1)
= 12 x 10-6 (100)(45 - 15) = 36 mm

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