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Two discs having moment of inertia $I_1$ and $I_2$ are made from same material have same mass. Their thickness and radii are $t_1, t_2$, and $R_1, R_2$ respectively. The relation between moment of inertia of each disc about an axis passing through its centre and perpendicular to its plane and its thickness is .......

• A
  $`I_1t_1^2=I_2t_2^2`$
• B
  $`I_1t_2=I_2t_1`$
• C
  $`I_1t_2^2=I_2t_1^2`$
• ✓
  $`I_1t_1=I_2t_2`$