A rectangular block of size $200 m m x 100 m m x 50 m m$ is subjected to a shear stress of $100 N / m m^{2}$ . If

modulus of rigidity of material is $1 x 10^{5} N / m m^{2}$ , strain energy stored will be

- 1
  
  $10 N . m$
- 2
  
  $25 N . m$
- 3
  
  $50 N . m$
- 4
  
  $100 N . m$

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