A rubber cord L metre long and having 
area of cross-section is suspended vertically. If the wire extends 1 m under its own weight, then change in length 
is (Take, density of rubber 
and Young's modulus of rubber 
).
A
B
C
D
L
Text Solution
Verified by ExpertsThe correct answer is:
A
Volume of the rubber cord 
Weight of the rubber cord 
The weight of the rubber cord acts at the center of gravity which is 
from the top.
So, Young's modulus, 
or 
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