The stress in a wire of diameter 2 mm, if a load of 100 g is applied to a wire, is

Options

A. `3.1xx10^(5)N//m^(2)`
B. `6.2xx10^(5)N//m^(2)`
C. `1.5xx10^(5)N//m^(2)`
D. `12.4xx10^(5)N//m^(2)`

Answer

A

Explanation

Stress `=(F)/(A) =(mg)/(pi r^(2))=(100 xx 10^(-3) xx 10)/(3.14 xx 10^(-6))`
`=(1)/(3.14) xx 10^(6) =3.1 xx 10^(5)`