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Q.

Moment of inertia of a ring is minimum

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a

 about a diameter 

b

about its geometric axis 

c

about a tangent in its plane 

d

 tangent perpendicular to its plane
 

answer is B.

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Detailed Solution

The ring's moment of inertia is minimum at its diameter.  

This is due to the ring's entire mass being concentrated at its edge.

Hence the correct answer is about a diameter.

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