A uniform square plate has a small piece Q of an irregular shape removed and glued to the centre of the plate leaving a hole behind in figure. The
moment of inertia about the z-axis is then,

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increased

decreased

the same

changed in unpredicted manner

answer is B.

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Detailed Solution

In the given diagrams, when the small piece Q removed and glued to the centre of the plate, the mass comes closer to the z-axis, hence, moment of inertia decreases.

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