A permanent magnet is a magnet that maintains its magnetic properties without the need for an external magnetic field. It is made of materials such as iron, cobalt, or nickel, and retains its magnetism indefinitely unless subjected to extreme conditions that can demagnetize it.
On the other hand, an electromagnet is a magnet that only exhibits magnetic properties when an electric current flows through it. It is typically made by wrapping a coil of wire around a core material, such as iron. When a current is passed through the wire, a magnetic field is generated, and the electromagnet becomes magnetized. When the current is turned off, the magnetic field dissipates, and the electromagnet loses its magnetic properties.
In summary, the main difference between a permanent magnet and an electromagnet is that a permanent magnet retains its magnetism without the need for an external current, while an electromagnet requires an electric current to generate a magnetic field. Additionally, permanent magnets are typically made of natural materials and do not require external power sources, while electromagnets are man-made and require an electrical current to function.
Explain/describe the difference(s) between a
permanent magnet and an electromagnet (contrast them).
1 answer
50 answers