Question

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 -

• A. $\frac{1}{{\ell }^2}$
• B. $\frac{1}{\ell }$
• C. ${\ell }^2$
• D. $\ell$

Answer 1

Answer: (C)

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