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Four small balls are placed at the corner of a square of length l. Evaluate MOI of system about a line passing through A and parallel to BD.

1)$$\sqrt3ml$$

2)$$3ml^2$$

3)$$2ml^2$$

4)$$ml^2$$

in Physics
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The correct option is 2) 3$$ml^2$$
$$I=2m({l\over\sqrt2})^2 +m({\sqrt2l)^2}$$
$$={2ml^2\over 2}+2ml^2=3ml^2$$