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MHT CET20239 May 2023Morning ShiftPhysicsRotational MotionActual

A square lamina of side ' b ' has same mass as a disc of radius ' R ' the moment of inertia of the two objects about an axis perpendicular to the plane and passing through the centre is equal. The ratio b R is

Options

  1. A1:1
  2. B3 :1
  3. C6 :1
  4. D1: 3

Correct answer

B. 3 :1

Step-by-step solution

aligned & I _ lamina = Mb ^2 6 & I _ disc = MR ^2 2 & Given Mb ^2 6 = MR ^2 2 & b ^2 R ^2 =3 & b R = 3 1 aligned

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