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A copper wire was subjected to a tensile stress... - JAMB Physics 2011 Question

A copper wire was subjected to a tensile stress of 7.7 x 107 x 10 Nm-2. calculate strain of the wire.


[young modules = 1.1 x 1011 Nm-2]
A
2. 0 x 10-5
B
7.0 x 10-3
C
7.0 x 10-4
D
2.2 x 10-4
correct option: c

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}

= 7.0 \times 10^{-4} )

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