A metal rod has a length of 1m at 30°C. 'alpha' of metal is 2.5 xx 10^(-3) //^(@) C. The temperature at which it will be shortened by 1 mm is

A metal rod has a length of 1m at 30°C. 'alpha' of metal is 2.5 xx 10

1.	A metal rod has a length of 1m at 30°C. 'alpha' of metal is 2.5 xx 10^(-3) //^(@) C. The temperature at which it will be shortened by 1 mm is
Answer» `- 30^(@) C` `- 40^(@) C` `- 10^(@) C` `10^(@) C` ANSWER :C