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Two loops P and Q are made from a uniform wire. The radii of P and Q  are r1 and r2 respectively, and their moments of inertia are l1 and l2 respectively. If l2/l1=4 then r2/r1  equals

(a)    42/3

(b)    41/3

(c)    4-2/3

(d)    4-1/3

Ans. b

(18)

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