A Magnetic field is generally interpreted as a region where the force of magnetism acts. This force of magnetism is mainly produced as a result of a moving charges or some magnetic material.
Form finely long straight current-carrying conductor magnetic field; B = MoI/4πa
= B ∝ 1/a
Magnetic field intensity is inversely proportional to the distance from the conductor.
Therefore, the explanation is inversely proportional to the distance from the conductor.
Characteristics of the magnetic field due to a current-carrying conductor
- It encircles the conductor.
- It lies in a plane perpendicular to the conductor.
- The reversal in direction of current flow reverses the direction of the field.
- The strength of the field is directly proportional to the magnitude of the current.
- The strength of the field is inversely proportional to the distance of the point from the wire.