First slide

Thermal expansion

Question

A metal rod having a linear coefficient of expansion 2 × 10^-5 /°C has a length 1m at 25°C, the temperature at which it is shortened by 1 mm is (1983 E)

Moderate

A

50°C
B

-50°C
C

-25°C
D

-12.5°C

Solution

$t_{2} - t_{1} = \frac{l_{2} - l_{1}}{l_{1} Δt}$

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