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The moment of inertia of a disc of mass m and radius r about an axis, which is tangential to the circumference of the disc and parallel to its diameter is
  • a)
    3/2mr2
  • b)
    2/3mr2
  • c)
    5/4mr2
  • d)
    4/5mr2
Correct answer is option 'C'. Can you explain this answer?
Most Upvoted Answer
The moment of inertia of a disc of mass m and radius r about an axis,...
We know that moment of inertia of a disc about its diameter is = 1/4mr2
In the figure AB is a diameter. Which passes through the centre of mass of the disc. CD is another axis which is parallel to AB and about which we shall have to calculate moment of inertia.
Now, from the theory of parallel axis
I = Ig + md2
= 1/4mr2 + mr2
= 5/4mr2
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