One quarter sector is cut from a uniform circular disc of radius R . This sector has mass M . It is made to rotate about a line perpendicular to its plane and passing through the centre of the original disc. Its moment of inertia about the axis of rotation is
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
A
The MI of 
th of the disc can be considered as difference of MI of the full disc and MI of 
th of the disc.
Given, Mass of 
th disc 
Hence, mass of the full circular disc is 
Let MI of the full disc be 
Let MI of one quarter of disc be 
Thus, MI of 
th of disc:
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