Acoil of many circular turns of insulated copper wire wrapped closing in the shape of a cylinder is called solenoid.
one end of the solenoid Behaves as a magnetic north pole, while the other behaves as the South Pole .the field lines inside the solenoid are in the form of parallel straight lines .this indicates that the magnetic field is the same at all points inside the solenoid.that is the field is uniform inside the solenoid.

Solenoid:
A solenoid is a long, cylindrical coil of wire that is tightly wound in the shape of a helix. It is used to generate a magnetic field when an electric current passes through it. The magnetic field created by a solenoid is similar to that of a bar magnet, with one end acting as the north pole and the other as the south pole.

Divergence of Magnetic Field Lines:
The divergence of magnetic field lines near the end of a current-carrying straight potential indicates the presence of a magnetic monopole, which is a hypothetical particle that has a magnetic charge similar to an electric charge. However, magnetic monopoles have never been observed in nature, and the divergence of magnetic field lines near the end of a straight potential is actually due to the nature of the magnetic field itself.

Explanation:
When a current flows through a straight wire, it creates a magnetic field around it. The magnetic field lines form concentric circles around the wire, with the direction of the magnetic field determined by the right-hand rule. Near the ends of the wire, the magnetic field lines start to diverge, meaning they spread out in different directions.

This divergence of magnetic field lines near the end of a current-carrying straight potential can be explained by considering the magnetic field as a vector field. The divergence of a vector field measures the rate at which the field spreads out or converges at a given point. In the case of the magnetic field, the divergence is zero everywhere except at the ends of the wire.

The divergence of magnetic field lines near the end of the wire indicates that the magnetic field is spreading out from a concentrated source. It is similar to how electric field lines diverge from a positive or negative charge. However, unlike electric charges which can exist as isolated particles (positive or negative), magnetic charges, or magnetic monopoles, have not been observed in nature.

Therefore, the divergence of magnetic field lines near the end of a current-carrying straight potential does not indicate the presence of magnetic monopoles. Instead, it reflects the nature of the magnetic field itself, which is generated by the flow of electric current in a wire.