First slide

Elastic Modulie

Question

Longitudinal stress of 1 N mm^-2 is applied on a wire. The percentage increase in length is
(Take, Y = 10¹¹ Nm^-2)

Easy

A

0.002
B

0.001
C

0.003
D

0.01

Solution

$Longitudinal strain = \frac{Stress}{Y} = \frac{10^{6}}{10^{11}} = 10^{- 5}$
Percentage increase in length = 10^-5 X 100 = 0.001%

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