An experiment is carried out to determine the Young modulus E of steel using a vertical wire of initial length L and cross-sectional area A. Various weights are suspended from the wire. A graph of extension against weight is plotted.
What does the gradient of the graph represent?

1 )
E
2 )
$\frac{\text{1}}{\text{E}}$
3 )
$\frac{\text{EA}}{\text{L}}$
$\frac{\text{L}}{\text{EA}}$
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