Q. 5
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 (Fig. 7.3). The moment of inertia about the z-axis is then
A. increased
B. decreased
C. the same
D. changed in unpredicted manner
Answer :
As the piece Q is removed and glued to centre, the moment of inertia decreases about z-axis as the
M.I
As the distance of that piece from z-axis is decreased to zero, hence its M.I will decrease. Hence, correct option is b.
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