Question

hiii guys

solve this question ​

Answer 1

Given

length of steel wire = 470cm

cross section of steel wire =3*10^-9cm^2

length of copper wire = 350cm

cross section area = 4*10^-9 cm^2

Now

we know that

young modulus = longitudinal stress /longitudinal strain = FL/la

since

where

L is the actual length F is the force a is the cross section area and l is the change in length

in question it is given that F and l is constant for both wire so

Young modulus directly proportional to its actual length and inversely to area of cross sectoon taking F/l is k

Ys/Yc = (kL(s)/a)/(k(Lc)/a

Ys/Yc =KL(s) *a /kL(c) *a

Ys /Yc = 470*4*10^-9/350*3*10^-9

Ys/Yc = 47*4/35*3

Ys/Yc = 188/105