Question

difine young's modulus for a material . a wire of length l and area of cross section a is streched by a force of magnitude F .it is found that length of wire is increased bt l

Answer 1

young modulus =stress/strain

where stress =force /Area
strain =change in length/original length
now,
stress =F/a

strain=dl/l

then ,
young modulus =F.l/A.dl