When a wire subjected to a froce along its length, its length increases by `0.4%` and its radius decreases by `0.2%` then the Poisson's ratio of the material of the wire is

Options

A. `0.8`
B. `0.5`
C. `0.2`
D. `0.1`

Answer

B

Explanation

`sigma = (-(Delta r)/(r)xx 100)/(+(Delta l)/(l) xx100)`