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MI of a ring is mr^2. If we treat rings as elements of a disc as well as of a hemisphere,then MI of a disc and of hemisphere should be same (becoz mass as well as perp. distance of every corresponding ring in both from the axis will be same , but actually not. What is wrong in the concept? (here axis is the axis passing through centre and perp. to plane in both cases)

MI  of a  ring is mr^2.


If  we  treat rings as  elements of a disc as well as of a hemisphere,then MI of   a disc and of hemisphere should be  same (becoz mass  as well as perp. distance of  every corresponding ring in both from  the axis will be same , but  actually  not. What is wrong in the concept?


           (here  axis  is the axis passing through centre and perp. to plane in both cases)

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