Why does the magnetic field appear as straight lines at the center of the circular loop formed by the bent wire carrying current?

The magnetic field around a circular loop formed by a bent wire carrying current appears as straight lines at the center due to the superposition of magnetic fields created by individual segments of the loop. Each segment contributes a magnetic field tangent to the loop at its location. At the center, these individual magnetic field contributions add up in the same direction, forming a net magnetic field that appears as straight lines passing through the center. This alignment of magnetic field vectors creates a region where the magnetic field is relatively uniform and straight, a characteristic feature observed at the center of the loop.