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JEEMAIN-2014
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Q)
The pressure that has to be applied to the ends of a steel wire of length
10
c
m
to keep its length constant when its temperature is raised by
100
∘
is (For steel, Young's modulus is
2
×
10
11
N
m
−
2
and coefficient of thermal expansion is
1.1
×
10
−
5
K
−
4
)
(
A
)
2.2
×
10
7
P
a
(
B
)
2.2
×
10
6
P
a
(
C
)
2.2
×
10
8
P
a
(
D
)
2.2
×
10
9
P
a
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