A magnetic dipole of magnetic moment 1.44 A m2 is placed horizontally with the north pole pointing towards north. Find the position of the neutral point if the horizontal component of the earth’s magnetic field is 18 μT.
Given,
M=1.44Am2
We know for a magnetic dipole with its pole pointing to the north, neutral point always lies in the broadside-on position.
let d be the perpendicular distance of the neutral point from midpoint of the magnet
the magnetic field due to the dipole at the broadside-on position(B) is given by