Reluctivity

Reluctivity:-It is a specific reluctance  and analogous to resistivity in electrical circuit

Permeance

permeance
It is measure of the ease with ,which magnetic flux lines can be established in the material
it is just reciprocal of the reluctance of the material  and is measured in wb/at [or] henry
permeance=1/Reluctance

magnetic flux

magnetic flux  

The total number of  lines  of force set up in  the a magnetic circuit is  called magnetic flux

Reluctance of any part of a magnetic circuit

 Reluctance of any part of magnetic circuit                                                                                                     The ratio of the drop in  magneto motive force to the flux produced  in that part  of the circuit

Reluctance ,S=NI/phi

reluctance [S]

Reluctance is proparty  of the substance ,which opposes the flow of magnetic flux through it
it  is denoted by the letter [S]
measured in AT/wb

magnetizing force [or] magnetic field intensity

Field intensity  at any point  in a magnetic field is  the force acting  on a unit n- pole placed  at that point

it is represented by H
measured in  newton/weber[or] At/M

magnetizing force ,H=m.m.f/mean length
NI/M

pertain to magnetic circuit , magneto motive force [m.m.f]

Magneto Motive Force[m.m.f] :- magneto  motive force is force  which drive [or] tends  to drive is magnetic flux through  a magnetic circuit like  electromotive force  in electrical circuit

m.m.f  =  number of turn's into current

=N into I=NI