A hollow steel shaft of external diameter $100 m m$ and internal diameter $50 m m$ is to be replaced by a solid alloy

shaft. Assuming the same value of polar modulus for both, the diameter of the solid alloy shaft will be

- 1
  
  $10 x \sqrt[3]{9375} m m$
- 2
  
  $10 x \sqrt[3]{9375 x 10} m m$
- 3
  
  $10 x \sqrt[3]{\frac{9375}{10}} m m$
- 4
  
  $\sqrt[3]{9375} m m$

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