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# A rod of initial lenght 2m at a temperature of 25oC is heated to 80oC. Calculate...

### Question

A rod of initial lenght 2m at a temperature of 25oC is heated to 80oC. Calculate the increase in length of the rod if its linear expansivity is 4.0 x 10-3K-1

### Options

A) 0.26m

B) 0.44m

C) 0.53m

D) 0.84m

The correct answer is B.

### Explanation:

$$l_2 - l_1 = \alpha l_1 (\theta_2 - \theta_1) = 4.0 \times 10^{-3} \times 2(80 - 25)$$

= 0.44m

## Dicussion (1)

• $$l_2 - l_1 = \alpha l_1 (\theta_2 - \theta_1) = 4.0 \times 10^{-3} \times 2(80 - 25)$$

= 0.44m