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 $I_2/I_1=4$ then $\frac{{{r_2}}}{{{r_1}}}$ equals

  • A

    $4^{2/3}$

  • B

    $4^{1/3}$

  • C

    $4^{-2/3}$

  • D

    $4^{-1/3}$

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