A rod of length 2 m rests on smooth horizontal floor. If the rod is heated from `0^(@)C" to "20^(@)С`. Find the longitudinal strain developed? `( alpha = 5xx10^(-5) //^(@)C)`

Options

A. `10^(-3)`
B. `2xx10^(-3)`
C. zero
D. `10^(-4)`

Answer

C

Explanation

Rod is free to expand from both ends and there is no external stress. Therefore strain =0.