A fixed volume of iron is drawn into a wire of length $L.$ The extension $x$ produced in this wire by a constant force $F$ is proportional to
A fixed volume of iron is drawn into a wire of length $L.$ The extension $x$ produced in this wire by a constant force $F$ is proportional to
- A
$\frac{1}{{{L^2}}}$
- B
$\frac{1}{L}$
- C
${L^2}$
- D
$L$
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