Different types of magnetic fields

     The core of a magnetic field is the area around a magnet where magnetic forces are exerted. Magnetic fields are usually generated both through magnetic materials and through moving electric charges. Magnetic fields are invisible but can be detected using certain tools and materials. For example, in strong neodymium magnet materials, the magnetic field is generated by the arrangement of the magnetic moments of electrons within the material and is an inherent property of substances such as iron, nickel and cobalt.

   Common magnetic field applications in life

     1. Magnetic cards and magnetic strips: Commonly used magnetic cards such as bank cards, credit cards, access control cards, etc. all contain magnetic strips. These magnetic strips contain specific magnetic field codes used to store and read data.

     2. Speaker: The speaker generates vibration in the magnetic field through electric current, thereby producing sound. They are widely used in audio systems, televisions, computers and other equipment.

     3. Electronic devices: Storage devices such as hard drives and magnetic tapes use magnetic fields to read and write data, and are widely used in computers and data storage.

     4. Motors and generators: Motors and generators are devices that convert electrical energy into mechanical energy using magnetic fields generated by custom curved neodymium magnets. Widely used in power tools, household appliances, transportation and other fields.

     5. Magnetic Resonance Imaging (MRI): MRI uses powerful magnetic fields and harmless radio waves to produce detailed images of the inside of the body, which is important for diagnosis and medical research.

     Magnetic fields are not just theoretical or used in advanced science. They are used in many aspects of modern life.

     Different magnetic fields of magnets

     1. Magnetic field of independent neodymium magnet in free space

     For a custom strong ndfeb magnet in an independent space, the magnetic field is generated by two polarities (north and south poles) and forms magnetic field lines in the space. Magnetic field lines flow from the south pole of the magnet to the north pole, forming a closed loop. Near the magnet, the magnetic field lines will be denser, indicating a stronger magnetic field; while farther away from the magnet, the magnetic field lines will become sparse, indicating a smaller magnetic field. The strength of the magnetic field gradually weakens with distance.

     2. The magnetic field generated by the neodymium magnet on the steel plate

     On the steel plate, the magnetic field of the magnet will be affected by the shielding effect of the steel plate, and the magnetic field distribution becomes more complex. The strength and distribution of the magnetic field will depend on the material and thickness of the steel plate and the distance between the magnet and the steel plate.

     3. The magnetic field generated between two magnets

     Depending on the relative position and polarity of the magnets, an attraction or repulsion effect may occur between the two magnets.

(1) Attraction effect: When the north and south poles of two magnets are close to each other, an attraction effect occurs between them. Magnetic field lines exit one magnetic pole and enter the other, forming a closed loop.

(2) Repulsion effect: When two magnets of the same polarity (two north poles or two south poles) are close to each other, a repulsion effect will occur between them. Magnetic field lines will try to spread out to minimize magnetic energy, so the magnets will push each other away.