AP EAMCET Engineering 2018 Apr 22 Shift 2 Paper

A short bar magnet of magnetic moment 0.21 Am‌2 is placed with its axis perpendicular to the direction of the horizontal components of the Earth’s magnetic field. The distance of the point on the axis of the magnet from the centre of the magnet where the resultant magnetic field is inclined at 45° with the horizontal component of the Earth’s field direction is _____
(Horizontal component of the Earth’s magnetic field = 4.2×10−5 T )