Question

b) The diameter of a wire is doubled, keeping
length same, its Young's modulus
(i) increases
(ii) decreases
(iii) remain same​

Answer 1

Answer:

Value of Y will remain same because Y=(longitudinal stress) /(longitudinal strain) and

longitudinal strain=l/L

if you make length double i.e. 2L then extension will also be double i.e. 2l

so longitudinal strain=2l/2L =l/L

again it is same so Young’s Modulus Y remains same.

It is property of a material(with in elastic limits) and

it does not depends on length, area of cross section and stress