Magnetic fields at two points on the axis of a circular coil at a distance of $0.05\,m$ and $0.2\,m$ from the centre are in the ratio $8 : 1$. The radius of the coil is.....$m$

  • A

    $1$

  • B

    $0.1$

  • C

    $0.15$

  • D

    $0.2$

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