A structural steel rod has a radius of 10 mm and length of 1.0m. A 100 kN force stretches it along its length Young's modulus of structural steel is `2xx 10^(11) Nm^(-2)`
Stress produced in the steel rod is

Options

A. `1.59 xx 10^(8) Nm^(-2)`
B. `3.18 xx 10^(8) Nm^(-2)`
C. `4.77 xx 10^(8) Nm^(-2)`
D. `6.36 xx 10^(8) Nm^(-2)`

Answer

B

Explanation

Stress = `(10)/(pi xx10^(-4)) = 3.18 xx 10^(8) Nm^(-2)`