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  4. A fixed volume of iron is drawn into a wire of length ℓ. The extension produced in this wire by a constant force F is proportional to -

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Q. A fixed volume of iron is drawn into a wire of length $\ell$. The extension produced in this wire by a constant force $F$ is proportional to -

Mechanical Properties of Solids

Solution:

$\Delta \ell \propto \ell^{2}$