The manufacturer of the magnetic field electromagnet tells you that an electromagnet is a device that generates electromagnetism when it is energized. A conductive winding that matches its power is wound on the outside of the iron core. This current-carrying coil is magnetic like a magnet, and it is also called an electromagnet. Magnetic field Electromagnet manufacturers tell you that the direction of the magnetic field of the electromagnet can be judged by Ampere's law.

Ampere's law is a law that expresses the relationship between current and the direction of the magnetic field lines of the current-excited magnetic field, also known as the right-hand spiral law.
(1) Ampere's rule in the energized straight wire (Ampere's rule 1): The magnetic field electromagnet manufacturer tells you to hold the energized straight wire with your right hand, with your thumb pointing in the direction of the current, then the direction of the four fingers is the circle of the magnetic field line direction.
(2) Ampere's rule in the energized solenoid (Ampere's rule 2): Hold the energized solenoid with the right hand, so that the four fingers are bent in the same direction as the current, then the end pointed by the thumb is the energized solenoid the N pole.
The relevant content about how to judge the magnetic field direction of the magnet is introduced here, and I hope it will be helpful to you.