Two wires are made of the same material and have the same volume. The first wire has cross-sectional area and the second wire has cross-sectional area 3A. If the length of the first wire is increased by 
on applying a force F, how much force is needed to stretch the second wire by the same amount? [NEET 2018]
Text Solution
Verified by ExpertsThe correct answer is:
C
According to the question,
For wire 1, 
… (i)
For wire 2, 
… (ii)
Volume, 
or 
Substituting the value of l in Eqs. (i) and (ii), we get
and 
As it is given that the wires are made up of same material, i.e. 
.
or 
(given, 
)
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