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Two loops P and Q are made from a unifor...

Two loops P and Q are made from a uniform wire. The radii of P and Q are `r_1` and `r_2` respectively and their moments of inertia are `I_1` and `I_2` respectively. If `I_1//I_2 = 4`, then `r_2//r_1` equals

A

`4^(2//3) : 1`

B

`1 : 4^(1//3)`

C

`1: 2

D

`4^(-1//2) : 1`

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