The 'why' of electromagnetic induction

[JanClaesen]

Are electromagnetic waves always caused by a moving charge? A magnetic field can induce current in a conductor if the magnetic flux going through this conductor changes, is this reversible? So does an electric field cause a magnetic field because the electric flux ('through' what?) changes? Is there an intuitive understanding of this phenomena?

 

[TheDestroyer]

Yes, the way to understand this is Maxwell equations, there you can see the symmetry between electric and magnetic fields :)

There you can see that: a flux of electric field causes a rotational magnetic field, and a flux of magnetic field causes a rotational electric field.

And there also you can do some assumptions about "magnetic charges" if you wish :D, heheheh. Some fancy imagination ;)

If you have some specific question, just ask :)

 

[astrokreng]

Electromagnetic induction is a fundamental principle in physics that explains the relationship between electricity and magnetism. It states that a changing magnetic field can induce an electric current in a conductor, and vice versa.

The 'why' of electromagnetic induction can be explained by the laws of electromagnetism, specifically Faraday's law and Lenz's law. These laws state that a changing magnetic field will create an electric field, and this electric field will induce a current in a conductor. This phenomenon is reversible, meaning that a changing electric field can also create a magnetic field.

It is important to note that electromagnetic waves are not always caused by a moving charge. While a moving charge can produce an electromagnetic wave, it is not the only way. Electromagnetic waves can also be produced by accelerating charges, such as in the case of radio waves.

In terms of the relationship between electric and magnetic fields, it is important to understand that they are interconnected and can influence each other. An electric field can cause a changing magnetic field, and a changing magnetic field can create an electric field. This is because they are both components of the electromagnetic force.

As for an intuitive understanding of this phenomenon, it can be helpful to think of it in terms of energy transfer. When a magnetic field changes, it creates a disturbance in the surrounding electric field, which then induces a current in a nearby conductor. This current can then be used to do work, such as powering a device.

In summary, electromagnetic induction is a fundamental principle that explains the relationship between electricity and magnetism. It is reversible, and both electric and magnetic fields can influence each other. Understanding this phenomenon is crucial in many areas of science and technology, from generators and motors to wireless communication.