Why do magnets come in so many shapes? Why do magnets with the same pole repel each other and with opposite poles attract each other?

Speaking of magnets, I believe everyone is familiar with them. We often see them in our daily lives, and we can also see magnets of various shapes. Why are magnets made in so many shapes? Why do magnets with the same poles repel each other and opposite poles attract each other? Why can magnets only attract iron but not copper? Let us enter the world of magnets in today's encyclopedia knowledge!

Contents of this article

1. Why are magnets made into so many shapes?

2. Why do magnets with the same poles repel each other and with opposite poles attract each other?

3. Why can magnets only attract iron but not copper?

Why are magnets made in so many shapes?

1. Making magnets in various shapes can reduce costs and save magnetic materials.

2. Magnets can be made into various shapes according to the choice of materials and the distance between the magnets and the materials, and their magnetism can be enhanced after special treatment.

3. Magnets can be made into various shapes to obtain magnetic fields in different directions and suitable magnetic circuit directions.

Why do magnets with the same poles repel each other and with opposite poles attract each other?

The reason why magnets with the same poles repel each other and magnets with opposite poles attract each other is that the magnetic field is generated by molecular currents. When the same poles of magnets approach each other, the molecular currents tend to weaken, thus generating a repulsive electromagnetic force. When the opposite poles of magnets approach each other, the molecular currents tend to increase, thus generating a repulsive force of attraction.

Why can magnets only attract iron and not copper?

There is a magnetic field around iron and magnets. In a magnetic field, some originally non-magnetic substances can become magnetic substances, which is called magnetization.

Iron can be magnetized into a "new magnet" in a magnetic field. Magnets have polarity, and like poles repel each other, while opposite poles attract each other. When iron is magnetized, the N pole of the "new magnet" is opposite to the S pole of the original magnet, so the magnet can attract iron.

All materials that can be magnetized, such as iron, nickel, cobalt and their alloys, can be attracted by magnets. However, copper, tin, aluminum, etc. do not have the property of being magnetized and cannot be attracted by magnets.