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A metal rod has a length of 1m at 30°C. 'α' of metal is 2.5 ×10^–5/°C. The temperature at which it will be shortened by 1mm is

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–30°C

–40°C

–10° C

10°C

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Correct option is C

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A metal rod has a length of 1m at 30°C. 'α' of metal is 2.5 ×10–5/°C. The temperature at which it will be shortened by 1mm is

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A metal rod has a length of 1m at 30°C. 'α' of metal is 2.5 ×10^–5/°C. The temperature at which it will be shortened by 1mm is