Magnetomotive Force: Causes, Effects & Wire Bending

[Rasine]

what is magnetomotive force? what causes it? what does it affect? and if 1 At is produced by a wire bent in a circualr shape carrying 1 A, why would the same wire produce 50 At if it was bent 50 times instead of once?

 

[burnhard gandah]

In simple terms, magnetomotive force is the effort exerted in creating a magnetic field. Increasing either the number of turns or the current in the coil will increase the mmf. The same changes will also increase the flux if the medium in which the coil is can carry more flux. To find the magnitude of the mmf a formula

mmf=turns x current

having more turns, say 50 increases the mmf since we add the mmfs "efforts" for all the turns. Each section of the coil (turn) contributes to the overall mmf.

 

[Graeme Robinson]

Magnetomotive force (MMF) is a measure of the strength of a magnetic field produced by a current-carrying wire. It is essentially the driving force that causes a magnetic field to be created. The unit of MMF is ampere-turns (At), which represents the number of turns of wire carrying 1 ampere of current.

The main cause of MMF is the flow of electric current through a wire. When an electric current flows through a wire, it creates a magnetic field around the wire. The strength of this magnetic field is directly proportional to the amount of current flowing through the wire. Therefore, the more current that flows through the wire, the stronger the magnetic field and the higher the MMF.

MMF affects the strength of a magnetic field and the level of magnetization in a material. It is also a key factor in determining the strength of an electromagnet. The higher the MMF, the stronger the magnetic field and the greater the force exerted on other magnetic objects.

In the example given, if a wire bent in a circular shape carrying 1 A produces 1 At, then bending the same wire 50 times would result in a total of 50 At. This is because each bend adds to the overall length of the wire, which in turn increases the number of turns and the total MMF. Therefore, the more turns of wire, the higher the MMF and the stronger the magnetic field.

In summary, magnetomotive force is the driving force behind the creation of magnetic fields and is directly related to the amount of current flowing through a wire. It affects the strength of a magnetic field and can be increased by increasing the number of turns of wire.