Magnetic Field Intensity | Definition Formula

Want create site? Find Free WordPress Themes and plugins.

Magnetomotive force, ℑ , per unit length, is called the magnetic field intensity H.

Magnetic Field Intensity Unit

Magnetic field intensity is also known as the magnetizing force which is measured is ampere-turns per meter (A-t/m).

Of primary concern, however, is the magnetomotive force needed to establish a certain flux density, B in a unit length of the magnetic circuit.

Magnetic Field Intensity Formula

The letter symbol for magnetizing force (magnetic field intensity) is H. The following relationship defines H as;



      ℑ =applied MMF in ampere-turns

      l =average length of the magnetic path in meters


Find the magnetic field intensity in the magnetic circuit shown below:


We can calculate the intensity using following formula:



If the dimensions of the magnetic path were changed, the value of H would also change. Fox example, if the total length of the magnetic path doubled, we should expect the value of H to decrease to one-half its previous amount.

If physical dimensions are double for the above circuit, then magnetizing force will be;


So, we can observe that, for a given number of ampere-turns, the magnetizing force varies inversely per unit length of the magnetic path.

You May Also Read:

Magnetomotive Force and Unit

Magnetic Flux Density Definition and Unit

Magnetic Flux Definition and Unit

Did you find apk for android? You can find new Free Android Games and apps.

Leave a Comment