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Four particles, each of mass m, are placed at the corners of a square having side l. Then moment of inertia of the particles about an axis passing through the centre of the square and perpendicular to its plane is 

a
14ml2
b
4ml2
c
12ml2
d
2ml2

detailed solution

Correct option is D

AO=BO=CO=DO=2l2=l2∴ I0=4×ml22=2 ml2

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Three point masses, each of m, are placed at the corners of an equilateral triangle of side l. Then the moment of inertia of this system about an axis along one side of the triangle is


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