Electrical Engineering ⇒ Topic : Magnetic Field Intensity

Lalan
 
MAGNETIC FIELD INTENSITY The ratio of magnetomotive force per unit length of the magnetic flux path is called magnetic field intensity. Its symbol is H. .............. (1) where L is the mean length of the magnetic circuit in metres. Magnetic field intensity is also called as magnetic field strength or magnetizing force. From Eq. (1), .................. (2)  
 
Gopal
 
Magnetic intensity (or field strength) at a point in a magnetic field is the force acting on a unit Npole (i.e., Npole of 1 Wb) placed at that point. Clearly, the unit of H will be N/Wb. Suppose it is desired to find the magnetic intensity at a point m  P situated at a distance d metres from a pole of strength m webers (See Figure (A). Imagine a unit north pole (i.e. Npole of 1 Wb) is placed at P. Then, by definition, magnetic intensity at P is the force acting on the unit Npole placed at P i.e. Figure. Magnetic intensity at P, H = Force on unit Npole placed at P
FIGURE (A)
The reader may note the following points carefully
 
 
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