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A metal rod has length of 1m at $20^{\circ} C . α$ of metal is $2 \times 10^{- 5} /^{0} C$ . The temperature at which its length will be decreased by 1mm is

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−10∘C

−20∘C

−30∘C

30∘C

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Correct option is C

Δl=l1αΔt

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A metal rod has length of 1m at 20∘C. α of metal is 2×10−5/0C. The temperature at which its length will be decreased by 1mm is

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A metal rod has length of 1m at $20^{\circ} C . α$ of metal is $2 \times 10^{- 5} /^{0} C$ . The temperature at which its length will be decreased by 1mm is