Considering magnetic field along the axis of a circular loop of radius \( R \), at what distance...

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Considering magnetic field along the axis of a circular loop of radius \( R \), at what distance from the centre of the loop is the field one eighth of its value at the centre?
(A) \( 4 R \)
(B) \( \sqrt{3} R \)
(C) \( 3 R \)
(D) \( 6 R \)
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