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A metal tape is calibrated at $20^{0} C . α$ of metal is $2 \times 10^{- 5} /^{0} C .$ Distance between 2 points is measured as 1 m at $30^{\circ} C$ . Correction to be made to get true distance is

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Correct option is B

Δl=l1αΔt

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A metal tape is calibrated at 200C. α of metal is 2×10−5/0C. Distance between 2 points is measured as 1 m at 30∘C. Correction to be made to get true distance is

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A metal tape is calibrated at $20^{0} C . α$ of metal is $2 \times 10^{- 5} /^{0} C .$ Distance between 2 points is measured as 1 m at $30^{\circ} C$ . Correction to be made to get true distance is