A metal rod having a coefficient of linear expansion of 2 × 10^-5/°C has a length of 100 cm at 20 °C.
A metal rod having a coefficient of linear expansion of 2 × 10-5/°C has a length of 100 cm at 20 °C. The temperature at which it is shortened by 1 mm is
(A) -40 °C
(B) -30 °C
(C) -20 °C
(D) -10 °C
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