Different between loadstone and Electromagnet ?
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Physics > Magnetism And Matter > Difference Between Permanent Magnet and Electromagnet
Magnetism And Matter
Difference Between Permanent Magnet and Electromagnet
Difference between Permanent Magnet and Electromagnet is magnetic field and strength. In Electromagnet, the magnetic field is created by a wire-wound coil but the magnetic field of Permanent (Bar) Magnet cannot be changed. The strength of Permanent Magnet depends on the material used for its creation, on the other hand, the strength of Electromagnet varies according to the flow of electric current into it. Three types of Permanent (Bar) Magnets are Ceramic Magnet, Flexible magnets, Neodymium iron boron magnet, and Samarium cobalt magnet. Each has its own applications and types. Let’s see the more differences between the Permanent Magnet and Electromagnet.
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Permanent Magnet
These types of magnets can retain their magnetism and magnetic properties for a longer time. Strongly magnetized hard materials make up permanent magnets. A perfect example of a permanent magnet is the Bar Magnet. This magnet widely explains the behavior of magnets. Actually, we call permanent magnets as Bar Magnets also.
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Electromagnet
When a battery is connected to a solenoid (a coil of wire is wounded around a nail), the apparatus behaves like a magnet. This is due to the magnetic field produced by the current flowing through the coil. The nail retains its magnetism until there is a current flowing through the coil, but once there is no current, the nail loses its magnetism.
You can produce electromagnets when you wound a coil of wire across an iron core. Let us now look at the differences between a permanent magnet and electromagnet.
Difference between Permanent Magnet and Electromagnet
Permanent (Bar) MagnetElectromagnetThey are permanently magnetized.These are temporarily magnetized.These are usually made of hard materials.They are usually made of soft materials.The strength of the magnetic field line is constant i.e. it cannot be varied.The strength of the magnetic field lines can be varied according to our need. The poles of a Permanent magnet cannot be changed.The poles of an electromagnet can be altered. Example of a permanent magnet is a Bar MagnetExample of a temporary magnet is solenoid wounded across a nail and connected to a battery.
Similarities between Permanent Magnets and Electromagnets
Both the magnets possess imaginary magnetic field lines. The magnets have north and south-pole whose behavior depends on the Geographic north-pole and south-pole of the earth. Both the magnets exhibit the properties of magnetism.

Advantages of Electromagnets over Permanent Magnets
You can get electromagnets at cheaper rates than the permanent magnets. This is because the cost of materials used in the electromagnet is lesser. You can alter the magnetic strength of an Electromagnet according to your need. This is not possible in case of a permanent magnet.
Answer:
Lodestone is one of only a very few minerals that is found naturally magnetized. Magnetite is black or brownish-black, with a metallic luster,
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