Does the value of young’s modulus change on changing the length of a wire ?

What is the SI unit of Young's modulus.

What is the value of Young's modulus for a perfectly plastic body?

What is the value of Young's modulus for a perfectly rigid body?

Two wires A and B have the same length and area of cross section. But young's modulus of A is two times the young's modulus of B. Then what is the ratio of force constant of A to that of B?

If S is stress and Y is Young’s modulus of material ofa wire the energy stored in the wire per unit volume is