A solenoid is a coil of many circular turns of insulated copper wire wrapped closely in the shape of a cylinder.

The convergence of the concentric circles at the center makes the arcs of these circles appear as straight lines, creating a distinct magnetic field pattern.

Applying the right-hand rule reveals that every section of the wire contributes to magnetic field lines in the same direction within the loop, enhancing the overall magnetic effect.

At the center of the circular loop, the arcs of the large concentric circles appear as straight lines, creating a unique magnetic field pattern.

he size of the concentric circles depends on the distance from the wire, following an inverse relationship similar to that observed with a straight wire.