Question

A wire of length 1m extends by 1mm when stretched by a load of 1kg .Find the area of cross-sectional of wire,if Y=2×10 11N/m2​

Answer 1

Answer:

Using the Young's modulus formulae consisting the stress and strain we get the cross-sectional area to be 5*10^-9 m

Answer 2

Explanation:

F= mg

F= 1×10 =10 (let g=10)

Y= stress/strain

= Fl/Adl

=10×1/A1×10*-3

A =10/2×10*11×10*-3 (Y=2×10*11)

A =5×10*-8m