What value of tensile stress is required to produce a strain of 10 x $10^{- 4}$ in copper? find the result in Mpa. ( Assume Young's modulus of copper = 50 GPa )

- 1
  
  150 MPa
- 2
  
  50 MPa
- 3
  
  200 MPa
- 4
  
  500 MPa

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