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A metre scale was calibrated at 0^@C . I...

A metre scale was calibrated at `0^@C` . If at `40^@C` is given the distance between two fixed points A and B as 12 mm (see figure ) then what is the actual distance between them , given that coefficient of thermal expansion `a = 10^(-5)//""^@C` .

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The correct Answer is:
12.0048 mm
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