A steel rail of length has a coefficient of linear expansion

PHYSICS · Single correct · CBSE · Physics · Thermal Properties of Matter · Thermal Properties of Matter

Problem

A steel rail of length

30\,\text{m}

has a coefficient of linear expansion

\alpha = 12\times10^{-6}\,\text{K}^{-1}

. Calculate the increase in its length when the temperature rises by

40\,^{\circ}\text{C}

. (a)

14.4\,\text{cm}

(b)

0.72\,\text{cm}

(c)

1.44\,\text{cm}

(d)

0.144\,\text{cm}