Question

Why the intensity of magnetic field lines increases on making circular loop?

Answer 1

The strength of the field is proportional to the closeness (or density) of the lines. ... (a) The magnetic field of a circular current loop is similar to that of a bar magnet. (b) A long and straight wire creates a field with magnetic field lines forming circular loops.

Answer 2

When wire is carrying current which runs through a straight wire, a circular magnetic field is generated around it. When a wire is made into a circle, the current generates a magnetic field parallel to its axis which increase the magnetic field strength.by piling the Coils on the top of each other