Question

Define young's modulus for a material. A wire of length L and area of cross section A is stretched by a force of magnitude F. It is found that the length of the wife is increased by delta l .Find: 1. longitudnal stress2.longitudnal strain3.young's modulus

Answer 1

☆ Physics
Youngs modulus
It is defined as the ratio of the normal stress to the longitudnal strain within the elastic limit .
Y = normal stress / long. strain

Longitudnal stress .
= F / A
Longitudnal strain
= delta l / L

Y = FL / pi r^2 delta l

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