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Four point masses, each of value m, are ...

Four point masses, each of value m, are placed at the corners of a square ABCD of side l. The moment of inertia of this system about an axis passing through A and parallel to BD is

A

`2 m l ^2`

B

` sqrt3 ml^2`

C

` 3ml^2`

D

` ml^2`

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The correct Answer is:
C
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