Four identical hollow cylindrical columns of mild steel support a big structure of mass 50×10³ kg. The inner and outer radii of each column are 50 cm and 100 cm respectively. Assuming uniform local distribution, calculate the compression strain of each column.[use Y=2.0×10¹¹Pa,g=9.8m/s²]
A.2.60×10⁻⁷
B.3.60×10⁻⁸
C.1.87×10⁻³
D.7.07×10⁻⁴