How much force is required to produce an increase of $0.2\%$ in the length of a brass wire of diameter $0.6\, mm$ (Young’s modulus for brass = $0.9 \times {10^{11}}N/{m^2}$)
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(c) $F = \frac{{YAl}}{L}$$ = 0.9 \times {10^{11}} \times \pi \times {(0.3 \times {10^{ - 3}})^2} \times \frac{{0.2}}{{100}} = 51\,N$
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