When current flows in a conductor, what is established around it?

When current flows through a conductor, it generates a magnetic field around the conductor. This magnetic field has a circular pattern that encircles the conductor. The direction of the magnetic field lines can be determined using the right-hand grip rule, which states that if you grasp the conductor with your right hand, with your thumb pointing in the direction of the current, the fingers will curl in the direction of the magnetic field lines.

This circular magnetic field arises because the movement of electric charge (current) generates magnetic forces, which radiate outward from the wire in a circular manner. The strength of this magnetic field is proportional to the amount of current flowing through the conductor; as the current increases, so does the strength of the magnetic field.

In contrast, linear magnetic fields, electric fields, and radiant fields do not accurately describe the nature of the magnetic field generated by a current-carrying conductor. The key aspect here is understanding how the magnetic field wraps around the conductor, giving rise to the circular pattern characteristic of electromagnetic phenomena.