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JAMB Physics 2011 Paper

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Question : 9

Total: 44

A copper wire was subjected to a tensile stress of 7.7 x 10^7. calculate strain of the wire.

[young modules = 1.1 x 1011 Nm-2]

2. 0 x 10^-5
7.0 x 10^-3
7.0 x 10^-4
2.2 x 10^-4

Solution:

Young modules = $\frac{\text{Tensile stress}}{\text{Tensile strain}}$

=

1.1 \times 10^{11} = \frac{7.7 \times 10^7}{\text{Tensile Strain}}

∴ Tensile strain =

\frac{7.7 \times 10^7}{1.1 \times 10^{11}}

=

7.0 \times 10^{7-11}<br> = 7.0 \times 10^{-4}

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