How magnetism , and motion form current?

Question

When you have motion of a magnetic in some coils. current is formed, I wonder why.

What happens inside the coil. why their electrons can move hence have current?

Answer 1

In answer to your question. let me begin by stating that electricity and magnetism are not completely understood. There are many proposed theories but NO ONE knows the complete answer.

Electricity and magnetism are not just related to each other, but are two different aspects of the same natural phenomenon. In 1865 English physicist James Clerk Maxwell figured out that there is really just one field—an electromagnetic field.

Maxwell's work showed that electricity and magnetism were connected. His equations showed that if electric charges are pushed or pulled, the changes in the speed of the charge create magnetic fields. In the same way, if magnetic fields change, they can create electric fields. This understanding allowed engineers to create electric generators that have big magnets. The generators create flowing electricity by pushing electric charges in wires with magnetic fields created by the magnets.

Maxwell's equations also showed that electric and magnetic fields could work together to make a moving wave. In one part of the wave, there is a strong electric field. In another part of the wave, there is a strong magnetic field. As the electric field dies away, it induces (which is a fancy word for creates) a magnetic field to take its place. When the magnetic field dies away, it creates a new electric field.

In extremely simple terms, the structure of an atom consists of a nucleus that contains protons and neutrons. The outer shells of the atom have electrons that spin in different orbits. It is the movement of these electrons when they "escape" from the atom that cause electricity; and the spinning direction, when still part of the atom, that causes magnetism. Electricity and magnetism are fundamentally related through electrons.

When a current flows through a wire, a magnetic field is set up because of the moving charges. If a wire is moved through a magnetic field so that it cuts across magnetic flux lines, the charges in the conductor will be acted upon by the magnetic force. This force will move the charges towards one side of the wire. Because of this, a potential difference between the ends of the conductor will occur. This potential difference is induced by the magnetic field.

In many power plants, huge rotating magnets make wires cut across their flux lines, generating the electricity that you get at home.

Another example of the relationship between magnetism and electricity is the Lorentz force (the force exerted on a charged particle in an electromagnetic field). Perhaps the most significant relationship between electricity and magnetism is light, which is known to physicists as an electromagnetic wave.

James Clerk Maxwell demonstrated that light is made of electric and magnetic fields that change very rapidly. Light waves are oscillating patterns of electric and magnetic fields, propagating through space at the speed of light (3x10^8 meters/second). The distance between two parts of a wave that have the same electric field strength is called the wavelength.

Light is the best known example, but microwaves, radio waves, X-rays, infrared and ultraviolet light are also electromagnetic waves.

Electric and Magnetic phenomena are intricately described by a collection of physical laws, known as Maxwell's equations. Fully understanding these complex equations require a thorough knowledge of calculus and differential equations. For more information, take a course in electromagnetic theory from your local university. :-)

If you should have any additional questions on what I've touched upon here please feel free to write to me directly.

Answer 2

The simplest explanation I can give is the principle of inductance. When a wire crosses the lines of magnetic flux in a magnetic field it will induce a current in a wire as the electrons will flow in a direction based on the magnetic field.

Magnetic fields can alter the movement or even induce movement of charged particles and since electrons have a negative charge they will move according to the Right Hand Rule.

The same principle applies to having a current run through a wire, it will create a magnetic field whose strength will be directly proportional to the level of current in the wire. The stronger the current, the stronger the magnetic field.

Answer 3

Magnetic Effect Of Current Or Electromagnetism The term"magnetic effect of current "means that"a current flowing in a wire produces a magnetic field around it". The magnetic effect of current was discovered by Oersted in 1820. Oersted found that a wire carrying a current was able to deflect a magnetic needle. Now, a magnetic needle can only be deflected by a magnetic field. Thus it was concluded that a current flowing in a wire always gives rise to a magnetic field round it. The magnetic effect of current is called electromagnetism which means that electricity produces magnetism .

Answer 4

the current induced by a magnetic field is due to the change in the magnetic flux(no.of magnetic lines of forces) passing through the conductor.
as a current carrying conductor produced a magnetic field similarly a variable magnetic field induces an emf in the conductor thus inducing current.

In 1819 Hans Christian Oersted discovered that an electric current creates a magnetic field.

Just over ten years later the English scientist Michael Faraday demonstrated the reverse effect. He showed how a magnetic field could be used to generate electricity.

Answer 5

A changing magnetic field creates an electric field in a process called induction (see reference link for more info). Charged particles move from areas of higher potential to lower potential in electric fields (for positive ions). This is what creates the current inside a coil from a moving magnet.

Answer 6

iThe Nature of magnetism is not quite understood as well as why a variable magnetic field induces an electric current in a conductor, except that it does.
Basically an electric current is a collision to collision interaction of electron type of motion producing an electric moving force in a circuit.As a result due to the motion and spin of the electron a moving magnetic field is produced.

Answer 7

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