Q66 / 90 · JEE Main 2021 (18 Mar Shift 2) · Physics

Consider a uniform wire of mass M and length L. It is bent into a semicircle. Its moment of inertia about a line perpendicular to the plane of the wire passing through the centre is :

  • A
    14ML2π2
  • B
    25ML2π2
  • Correct answer
    C
    ML2π2
  • D
    12ML2π2

Solution

πr=L⇒r=Lπ
I=Mr2=ML2π2

Hence, the correct answer is option: 'C'.

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