As a result of two magnetic fields acting at the same place, the resultant field has a special feature. At a particular point, if the compass needle does not point in any particular direction, then there is no net magnetic field at the point. Such a point is called Neutral point or the Null point.
A neutral point is a point where the resultant magnetic field is zero.
Figure (a) and (b) shown below illustrate the null points when the magnet is placed in two different positions.
At the two points marked X in figure, the earth's magnetic field and the magnet's field are exactly equal and opposite and the resultant field is zero. These points are called the neutral points.
