A load of 20N on a wire of cross-sectional area... - JAMB Physics 1997 Question
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 Option: 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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