Question

Two exactly similar wires of steel and copper are stretched by equal forces. If the total elongation is 1cm elongation of copper wire is

Answer 1

Dear student, please try to post the question completely so that we can answer.Hope so the solution helps you.
  
Given :
Ys=Y for steel 20×10¹⁰ N/M²
Yc=Y for copper is 12×10¹⁰ N/M²
ΔLs+ΔLc=1 ----------------equation 1

Ys= FL/ A ΔLs
Yc=FL/ A ΔLC
⇒Ys/Yc=[FL/ A ΔLs] /[FL/ A ΔLC]
⇒Ys/Yc=ΔLc/ΔLs
⇒ΔLc/ΔLs=Ys/Yc =20x10¹⁰/12x10¹⁰ = 5/3
As ΔLs+ΔLc=1
ΔLs[1+ΔLc/ΔLs]=1
⇒ΔLs[1+5/3]=1
⇒ΔLs[8/3]=1
⇒ΔLs=3/8=0.375cm
on substituting the value of ΔLs in equation (1), we get value of ΔLc
ΔLc=0.625cm

Answer 2

See the attachement

.

#khushi here✔️