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If the stress on a wire is 107NM-2 and the wire is stretched from its...

Physics
JAMB 1999
If the stress on a wire is 107NM-2 and the wire is stretched from its original length of 10.00 cm to 10.05 cm. The young's modulus of the wire is
  • A. 5 . 0 x 104 Nm-2
  • B. 5 . 0 x 105 Nm-2
  • C. 2 . 0 x 108 Nm-2
  • D. 2 . 0 x 109 Nm-2
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Correct Answer: Option D
Explanation
Y = stress/strain, but stress = 107Nm-2 (given).

Strain = e/l0. = (10.05 - 10.00)/10.00 = 0.005

Thus Y = 107/0.005 = 2 . 0 x 109Nm-2
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