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Sep 6, 2018 at 8:51 comment added Sayantan Das I think you misunderstood my question. I have mentioned that the value of cross sectional area for both of them are same......area of the ring = area of the circle = A......in some way......so you can assume the hollow one to be larger than the filled one
Sep 6, 2018 at 4:50 history answered user205846 CC BY-SA 4.0