A copper wire was subjected to a tensile stress of 7.7 x 107 x 10…

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 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} )

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