A tensile force produces an extension ∆L in a steel wire of initial length L and diameter d.
The same steel is used to make a second wire of initial length 2L and diameter $\frac{d}{2}$.
What is the extension when the same force is applied to the second wire?
1 )
$\frac{{∆L}}{2}$
2 )
2∆L
3 )
4∆L
8∆L
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