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

Physics
JAMB 2011

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]

  • A. 2. 0 x 10-5
  • B. 7.0 x 10-3
  • C. 7.0 x 10-4
  • D. 2.2 x 10-4
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Correct Answer: Option C
Explanation

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 = \( \frac{7.7 \times 10^7}{1.1 \times 10^11} \)

= \( 7.0 \times 10^{7-11}
= 7.0 \times 10^{-4} \)

There is an explanation video available below.


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Explanation Video

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Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts
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