Magneto motive force and magnetic field strength


The Magneto-motive force (mmf) is the cause due to the presence of the a magnetic flux in a magnetic circuit,

mmf,Fm=NI amperes

where N is used to represent the number of conductors (or turns) and I represents the current in amperes. We sometimes express the unit of mmf as ‘ampere-turns’. As we know, since ‘turns’ have no dimensions, the SI unit of mmf is the ampere. Magnetic field strength (or magnetizing force),

H= NI/l ampere per metre

where l stands for the mean length of the flux path in metres.
Thus mmf =NI= Hl amperes.




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