Question

Prove that young's modulus of wire is equal to the stress necessary to double its length

Answer 1

Answer:Young's modulus, E =

strain

stress

​

Where, strain=

original length

change in length

​

Let the initial length of the wire be x m.

Thus change in length =2x−x=x

Original length =x

So, strain = 1

So, we get E= stress/1