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Q.

Four equal masses, m each are placed at the corners of a square of length ( l ) as shown in the figure. The moment of inertia of the system about an axis passing through A and parallel to DB would be:

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a

3ml2

b

ml2

c

2ml2

d

3ml2

answer is D.

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Detailed Solution

I1=2ml22Using parallel axis theorem     I2=I1+4ml22=ml2+2ml2=3ml2
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