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A metal rod having a coefficient of line...

A metal rod having a coefficient of linear expansion of `2 xx 10^-5 /^@C` has a length of 100 cm at `20^@C`. The temperature at which it is shortened by 1 mm is

A

`-30^@C`

B

`70^@C`

C

`-20^@C`

D

`-10^@C`

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