Question

A copper wire of 1mm diameter is stretched by applying a force on 10N . find the stress in the wire??

Answer 1

     ⇒ Stress= force/area
      
     ⇒Stress = 10/πr²
         
             ⇒ 10/π(d/2)²
            ⇒ 10/π(1x10^-6/2)²

            ⇒4x10/3.14x10^-6
            ⇒ 40x10^6/3.14

            ⇒12.7x10^6 N/m²