(b) Mg(L1-L)/ AL
(c) MgL / AL1
(d) MgL
/ A(L1
-L)
Solution
Longitudinal stress can be defined
as the force acting per unit cross-section of wire.
Longitudinal strain can be defined as the ratio of change in length of wire to original length.
According to Hook’s law, with in elastic limit. strain varies inversely
with stress
Where ‘Y’ is young’s modulus
Option D is correct
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