61. From a uniform wire, two circular loops are made (i) P of radius r and (ii) Q of radius nr. If the moment of inertia of Q about an axis passing through its centre and perpendicular to its plane is 8 times that of P about a similar axis, the value of n is (diameter of the wire is very much smaller than r or nr)
(a) 8
(b) 6
(c) 4
(d) 2
Ans. d
(5)
5/5 - (1 vote)
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