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How Is an Electromagnet Different From a Permanent Magnet?

A permanent magnet is an object with a magnetic field of its own. It's called a permanent magnet because it exists outside the influence of any external magnetic fields and does not lose its magnetic field if heated (unlike electromagnets). Magnets are very effective because they can create an unseen field around themselves, amplifying their attracting effects. This means that large magnets aren't required to generate huge magnetic fields.

An "electromagnet" is a magnet that generates a magnetic field when an electric current flows through it. Electromagnets, like bar magnets, typically have a North and South Pole. Electromagnets are used in motors, generators, relays, transformers, and speakers. The lectromagnets are the quickest and easiest means to generate a magnetic field over a short distance, which is why they are used in modern technology such as speakers, hard drives, and even MRI equipment.

 

Difference between Electromagnet and Permanent Magnet
Electromagnet Permanent Magnet
It becomes magnetic when electric current is applied. It becomes magnetic once it has been induced with a magnet
Magnetic strength is dependent on the flow of current, The strength of a magnet depends upon the nature of the material used.
It can be demagnetized once electric current is not applied. If it loses magnetism, it can’t regenerate unless re-magnetized.
Continuous supply of electricity is needed to maintain the magnetic field. Permanent magnets are always magnetized in specific conditions.
It is normally made of soft materials It is normally made of hard materials
The poles can be changed The poles of magnets cannot change

 

Magnetic Strength:

 

The strength of an electromagnet is determined by the material used in its construction and the amount of electric current flowing through it. The material used in an electromagnet has an impact on its strength.

The strength of a permanent magnet is determined by a few factors: The magnet's substance — neodymium magnets, for example, are more powerful than ceramic or alnico magnets. P.S A rare earth element is used to make neodymium magnets. Rare earth magnets are the most powerful permanent magnets, allowing them to cling onto heavier objects with less electrical force (up to twice as much as ceramic or alnico magnets).

 

Magnetic Loss Properties:

 

When a permanent magnet (a magnetic monopole) is heated to a specific temperature, it loses its magnetic characteristics. If a permanent magnet crosses that limit, it becomes ineffective and can no longer be used to take up objects.

This is accomplished by the process of demagnetization. When a magnet is exposed to a dynamic magnetic field, a phenomena happens. Rapid variations in field direction can cause the domains on a magnet to "flip" from one orientation to the opposing orientation, partially or fully.

A magnetic field is created when a current passes through the coil of wire of an electromagnet. However, unlike permanent magnets, this field vanishes when the electric current is turned off. The electromagnet, on the other hand, builds up its field once it's turned on again — for as long as it's currently running through it. Electromagnets, on the other hand, require electric current to control their magnetic field, so you can make them as weak or as strong as you like simply regulating the current.

 

Advantages Comparison:

 

An electromagnet requires a continual flow of electricity to stay magnetic, but a permanent magnet does not. Permanent magnets are widely utilized in loudspeakers, while electromagnets are often used to hold heavy materials or objects in the industry level.

Electromagnets can adjust their magnetic field by varying the strength of the electric current that generates it, and they can manipulate the electromagnetic field generated by an electric current. They've been used to make some really remarkable things, such as a super-strong magnet that can pull up practically anything and even break glass. Electromagnets manage their magnetic field with an electric current, so you can make them as weak or as strong as you like.

 

Disadvantages of Permanent Magnets

Permanent magnets that are kept at temperatures over a specific point can lose their capacity to generate a magnetic field. As a result, they are unsuitable for use in hot-device applications.

The magnetic field intensity of a permanent magnet weakens over time. As a result, it is preferable if you consider it when selecting the best permanent magnet for your application.

 

Disadvantages of Electromagnets

Electromagnets with copper windings present a slew of challenges. For starters, they are unsuited for use in confined spaces. Second, they necessitate specialised care and maintenance in order to perform effectively. There is always the risk of a short circuit, which might harm your magnet. Electromagnets are expensive to operate due to the cost of electric current. As time passes, the material in which the coil is wrapped weakens, as does the magnetic field.

 

Conclusion:

Magnets, in the most basic sense, are objects that generate magnetic fields. The first concept to grasp is that a magnet has two poles, north and south. When you place another magnet near the first one, the poles attract and stick together.

Electromagnets are devices that generate magnetic fields by using electricity. These gadgets can pick up and move items as well as measure magnetic fields. Electromagnets, like conventional magnets, have a north and south pole and can only function when an electric current is passed through them. They are used to power electric motors, generators, relays, transformers, and speakers.

Both types of magnets are everywhere around us, from a hard disc drive to a refrigerator door, and they do their jobs well. In this blog Mag Spring discussed about how is an Electromagnet Different From a Permanent Magnet along with advantages and disadvantages of each type.

 

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