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As shown in the figure, in an experiment to determine Young's modulus of a wire, the extension-load curve is plotted. The curve is a straight line passing through the origin and makes an angle of 45⁰ with the load axis. The length of the wire is 62.8 cm, and its diameter is 4 mm. The Young's modulus is found to be A × 10⁴ Nm^-2. The value of A is---
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7.5

answer is B.

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Detailed Solution

$Y = \frac{FL}{({πr}^{2}) ΔL}$
Where $\frac{ΔL}{F} = \tan 45^{\circ} = 1$ on substituting the values we get x=5.

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