Does the magnet change its magnetism after being energized

The first thing to note is that it should be an energized solenoid (use the left hand to determine the direction of the magnetic field).

Put a ferromagnetic substance in an energized solenoid.

or a soft magnetic rod, the strength of its magnetic field.

will be enhanced. This is because, the magnetic field is generated by electrons spinning at high speed. However, the strength of the current and the number of turns and length of the solenoid affect the number of electrons involved in the creation of this magnetic field.

Not all electrons will be in the same direction as it, there will always be some anisotropy, and these anisotropic ones will produce coercivity.

When the solenoid is removed, the magnetic field of the soft magnetic rod disappears, but some of the coercivity remains.

It was supposed to be a magnet.

is called a hard magnet or a permanent magnet. It is due to its special structure that determines that the coercivity that generates the magnetic field is very large. This is the hard magnetic field.

However, if the current is large enough and the number of turns is large enough, the energized solenoid can only change the direction of the magnetic field as a whole. It does not change the internal structure of the magnet itself. Therefore, when the energized solenoid is removed, the magnetic field direction of the magnet remains the same.

Otherwise, why do people make soft ferrite in large quantities?

Hehe, our company is manufacturing manganese-zinc ferrite. Is there a need?

To look at the electromagnetic direction after the power is applied, the direction of the magnetic poles is the same, and the enhancement. If the direction is reversed, the magnet force weakens the magnet force, and an equal magnet force equals 0, and the magnet force is reversed.

Yes, energized magnets produce magnetic fields.

When an electric current is passed through a magnet, a magnetic field is generated, which is due to the fact that the current passing through the conductor creates a magnetic field. The direction of the magnetic field of the magnet is related to the direction of the current and follows the right-hand rule. Specifically, if you point the thumb of your right hand in the direction of the current, then the direction of the curve of the four fingers is the direction of the magnetic field.

When the current stops, the magnetic field also disappears.

Put a small magnetic needle next to the energized straight wire, and when energized, the small magnetic needle will rotate at an angle and point in a direction perpendicular to the straight wire. The direction of rotation depends on the position of the small magnetic needle relative to the straight wire.

According to Ampere's rule (also known as the right-handed spiral rule, one of Ampere's rules in energized straight wires, which is the rule that expresses the relationship between the direction of the magnetic field lines of the electric current and the magnetic field excited by the current): hold the energized straight wire with your right hand and let your thumb point in the direction of the current of the straight wire, then the curved four fingers indicate the direction of the magnetic field around the wire, and the four fingers point to the direction of the induced magnetic field lines. The small magnetic needle will rotate at the smallest angle until the magnetic field lines of the magnetic needle are in the opposite direction to the induced magnetic field lines of the wire.

It can generate a magnetic field.

Electromagnets. It is composed of an iron core and coil winding. The magnetic field is generated by the energized coil windings: direct current.

It generates a stable magnetic field with a ridge of rent, and the source of the defect seeps alternating current.

An alternating magnetic field is generated. The core material is generally electrical soft iron, which is a good magnetically conductive cracked jujube material, and its function is to make the magnetic field generated by the coil converge and enhance the local magnetic force.

For DC solenoids, it is not a big problem to remove the core and energize it. For AC solenoids, another important role of the core is to increase the inductive reactance of the coil. If the extracted core is energized, the inductive reactance of the coil is greatly reduced, and the current through the coil will exceed the rated value, and the coil will burn out.

Be safe!