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JEE Main Physics Class 11 Properties of Solids and Liquids Questions Part 1 Questions
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© examsnet.com
Question : 55
Total: 100
A structural steel rod has a radius of 10 mm and length of 1.0 m. A 100 kN force stretches it along its length. Young’s modulus of structural steel is
2
×
10
11
N
m
–
2
.
The percentage strain is about
[Online May 7, 2012]
0.16%
0.32%
0.08%
0.24%
Validate
Solution:
Given:
F
=
100
k
N
=
10
5
N
Y
=
2
×
10
11
N
m
−
2
l
0
=
1.0
m
radius
r
=
10
m
m
=
10
−
2
m
From formula,
Y
=
Stress
Strain
⇒
Strain
=
Stress
Y
=
F
A
Y
=
10
5
π
r
2
Y
=
10
5
3.14
×
10
−
4
×
2
×
10
11
=
1
628
Therefore
%
strain
=
1
628
×
100
=
0.16
%
© examsnet.com
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