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JAMB Physics 2021 Paper

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Question : 25

Total: 40

If the stress on a wire is 10

^{7}

^{-2}

and the wire is stretched from its original length of 10.00m to 10.05m. The young's modulus of the wire is?

5.0 x 10 $^{-4}$ Nm $^{-2}$
5.0 x 10 $^{-5}$ Nm $^{-2}$
2.0 x 10 $^{-8}$ Nm $^{-2}$
2.0 x 10 $^{9}$ Nm $^{-2}$

Solution:

Young's modulus $\frac{\text{stress}}{\text{strain}}$

Strain = $\frac{e}{l} = \frac{0.05}{10} = \frac{10^{7}}{0.005}$

2 x 10 $^{9}$ Nm $^{-2}$

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