Three identical rings of radius a are placed ...
Three identical rings of radius a are placed on the xy-plane so that each ring touches tine other two tangentially. Each ring, which may be considered to be infinitesimally thin, has a mass M. The centres of three equidistant from the z-axis this common distance being 2a/√3 . What is the moment of inertia of this  system about the z-axis.
• a)
3 ma2
• b)
6 ma2
• c)
7 ma2
• d)
None of these

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 VEENA MODANI Sep 05, 2019
Related Three identical rings of radius a are placed on the xy-plane so that each ring touches tine other two tangentially. Each ring, which may be considered to be infinitesimally thin, has a mass M. The centres of three equidistant from thez-axis this common distance being 2a/√3 .What is the moment of inertia of thissystem about the z-axis.a)3 ma2b)6 ma2c)7 ma2d)None of theseCorrect answer is option 'C'. Can you explain this answer?
Using parallel axis theorem
Ml of each ring about z-axis

So. Ml of whole system about z-axis

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