A load of 20N on a wire of cross-sectional area 8 x 10-7m2, produces an...

JAMB 1997

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

A. 7.0 x 10¹¹Nm^-2
B. 7.5 x 10¹¹Nm^-2
C. 8.5 x 10¹¹Nm^-2
D. 9.0 x 10¹¹Nm^-2

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Correct Answer: Option B

Explanation

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...

Correct Answer: Option B

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