A load of 20N on a wire of cross-sectional area 8 x 10^-7m², produces an extension of 10m². calculate Young's modulus for the material of the wire if its length is 3m

7.0 x 10¹¹Nm^-2

7.5 x 10¹¹Nm^-2

8.5 x 10¹¹Nm^-2

9.0 x 10¹¹Nm^-2

Correct answer is B

Young's modulus = \(\frac{F}{A}\) \(\div\) \(\frac{e}{L}\)

= \(\frac{20}{8 \times 10^{-7}}\) \(\div\) \(\frac{10^{-4}}{3}\)

= 7.5 x 10¹¹Nm^-2

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A load of 20N on a wire of cross-sectional area 8 x 10-7m2, produces an extension of 10m2. calculate Young's modulus for the material of the wire if its length is 3m