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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