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 . The moment of inertia about the z-axis, then
A
increased
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B
decreased
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C
same
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D
changed in unpredicted manner
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Solution
The correct option is B decreased In the given diagram, 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 interia decreases.