The scale on a steel metre stick is calibrated at $20^o\,C$.The error in the reading of $50\,cm$ at $30^o\,C$ is: (take linear expansion coefficient of steel $= 1.0 \times 10^{-5} / ^oC)$
The scale on a steel metre stick is calibrated at $20^o\,C$.The error in the reading of $50\,cm$ at $30^o\,C$ is: (take linear expansion coefficient of steel $= 1.0 \times 10^{-5} / ^oC)$
- A
$10^{-3} \,cm$
- B
$2 \times 10^{-3} \,cm$
- C
$5 \times 10^{-3} \,cm$
- D
$10^{-2} \,cm$
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