A cylindrical bar of $20 m m$ diameter and $1 m$ length is subjected to a tensile test. Its longitudinal strain is $4$ times that

of its lateral strain. If the modulus of elasticity is $2 x 10^{5} N / m m^{2},$ then its modulus of rigidity will be&n

- 1
  
  $8 x 10^{6} N / m m^{2}$
- 2
  
  $8 x 10^{5} N / m m^{2}$
- 3
  
  $0.8 x 10^{4} N / m m^{2}$
- 4
  
  $0.8 x 10^{5} N / m m^{2}$

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