The magnetic field at a point x on the axis of a small bar magnet is equal to the field at a point y on the equator of the same magnet. The ratio of the distances of x and y from the centre of the magnet is [MP PMT 1990]

• A.            \[{{2}^{-3}}\]                        
• B.            \[{{2}^{-1/3}}\]
• C.            \[{{2}^{3}}\]                         
• D.            \[{{2}^{1/3}}\]