the magnetomotive force (mmf) is a quantity appearing in the equation for the magnetic flux in a magnetic circuit, often called Ohm's law for magnetic circuits.It is the property of certain substances or phenomena that give rise to magnetic field

2) Reluctance

Magnetic reluctance, is a concept used in the analysis of magnetic circuits. It is defined as the ratio of magnetomotive force (mmf) to magnetic flux.

 3) Flux

the quantity which passes through a surface or substance or measurement of the total magnetic field which passes through a given area.

 4) Field Intensity

is a ratio of the MMF needed to create a certain Flux Density (B) within a particular material per unit length of that material. 

 5) Flux Density

The number of magnetic lines of flux that pass through a certain point on a surface

 6) Permeability

Is a measure of the ease by which a magnetic flux can pass through a material

Coil generates magnetic field in magnetic core. Driving force, F needed to overcome core reluctance, R. The MMF is generated by the coil. Strength related to number of turns and currents, measured in Ampere turns (At).

2) RELUCTANCE
Resistance” to flow of magnetic flux. Associated with “magnetic circuit” – flux equivalent to current.  Also to be defined the ratio of magnetomotive force (mmf) to magnetic flux. 

3) FLUX
Flux is a measurement of the total magnetic field which passes through a given area. It is a useful tool for helping describe the effects of the magnetic force on something occupying a given area. The measurement of magnetic flux is tied to the particular area chosen.

4) FLUX INTENSITY
The longer the magnetic path the greater the MMF required to drive the flux. Magnetomotive force per unit length is known as the “magnetizing force” H or Magnetic field intensity.

5) FLUX DENSITY
Flux density (Magnetic flux density) is represent by symbol “B”. The flux density is the number of magnetic lines of flux that pass through a certain point on a surface. The SI unit is T (tesla), which is weber per square metre (Wb/m2) and the unit in the CGS system is G (gauss). 1 tesla is equivalent to 10,000 gauss.

6) PERMEABILITY
Permeability μ is a measure of the ease by which a magnetic flux can pass through a material (Wb/Am). Permeability of free space μo = 4π x 10-7 (Wb/Am)

Before you do circuit analysis, lets recall this term:
 Define:
 1) Magnetomotif Force
 2) Reluctance
 3) Flux
 4) Field Intensity
 5) Flux Density
 6) Permeability

- It is the external force required to set up the magnetic flux lines within the magnetic material.

- The magneto motive force F is equal to the product of the number of turns around the core and the  current through the turns of wire.

F = NI

- It is the property of a material which opposes the creation of magnetic flux in it

- It is analogous to resistance in an electrical circuit

- the action or process of flowing or flowing out.

 = The magnetomotive force per unit length

    H = NI/l At/m

= The number of magnetic lines of flux that pass through a certain point on a surface

   - Β = φ/A Wb/m^2

It is the degree of magnetization of a material to allow magnetic flux to pass through it.

It is analogous to conductivity in an electrical circuit

 Define:

1) Magnetomotif Force

The magnetomotive force, mmf, is analogous to the electromotive force and may be considered the factor that sets up the flux, φ. The mmf is equivalent to a number of turns, N of wire carrying an electric current, I and has units of ampere-turns. If either the current through a coil (as in an electromagnet) or the number of turns of wire in the coil is increased, the mmf is greater; and if the rest of the magnetic circuit remains the same, the magnetic flux increases proportionally.

2) Reluctance

The reluctance of a magnetic circuit is analogous to the resistance of an electric circuit. Reluctance depends on the geometrical and material properties of the circuit that offer opposition to the presence of magnetic flux. Reluctance of a given part of a magnetic circuit is proportional to its length and inversely proportional to its cross-sectional area and a magnetic property of the given material called its permeability.

3) Flux

The magnetic flux in magnetic circuit is analogous to the electric current in electrical circuit. Just like current, flux has magnitude and direction. The direction of magnetic flux of normal permanent magnet is normally North to South direction. In electromagnetic reaction , the direction of flux can be defined using left hand rule.

4) Field Intensity

Magnetic field intensity, H is known as magnetomotive force per unit length. It is a measure of the magnetic flux strength on certain distance or length. Magnetic flux intensity diminishes with increasing distance from a straight current-carrying wire or a straight line connecting a pair of magnetic poles around which the magnetic field is stable.

5) Flux Density

Flux density (Magnetic flux density), B is the number of magnetic lines of flux that pass through a certain point on a surface of area. At a given location in the vicinity of a current-carrying wire, the magnetic flux density is directly proportional to the current, I in amperes, including the coil number of turns, N.

6) Permeability

Permeability μ is a measure of the ease by which a magnetic flux can pass through a material (Wb/Am). Permeability of free space μo = 4π x 10-7 (Wb/Am). Relative permeability μr varies depends on material used. The total permeability is calculated as μ = μr  x μo.

total magnetic field which passes through a given area 

   ɸ = NI/R

(4) Field Intensity

flux intensity is the magnetic field of an electrically charged current

  H = B/µ

(5) Flux Density
the amount of magnetic flux pass through the area or substances

  Β =  ɸ /A

(6) Permeability
is a measure of the ease by which magnetif flux can pass through a material.

   µ_r = µ/µ₀

while µ₀ = 4n x 10^-7 (Wb/Am)

PART 2 - Simple Series Circuit

Permeability is the ability to support formation of magnetic fields in a material

- The Permeability of Free Space( µ₀ )

-The Relative Permeability

The relative permeability is the ratio of the permeability of a specific medium to the permeability of free space µ₀

µ = permeability of the medium (H/m) 

Flux is a measurement of the total magnetic field which passes through a given area. It is a useful tool for helping describe the effects of the magnetic force on something occupying a given area. The measurement of magnetic flux is tied to the particular area chosen.
ɸ = NI/R

(4) Field Intensity, H

is a ratio of the MMF needed to create a certain Flux Density (B) within a particular material per unit length of that material. H = B/µ

(5) Flux Density
The flux density is the number of magnetic lines of flux that pass through a certain point on a surface. The SI unit is T (tesla), which is weber per square metre (Wb/m2)
Β =  ɸ /A

(6) Permeability, µ
the total magnetif flux can pass through a material.
 µ= µ_rµ₀ 

-    Magneto motive force is the ability creates a magnetic flux in magnetic circuit. 

2)   Reluctance, (R)

-    The resistance to magnetic flux offered by a magnetic circuit, determined by the permeability and arrangement of the material of the circuit. 

3)  Flux, (F)

-     Flux is the presence of a force field in a specified physical medium, or the flow of energy through a surface. In electronics, the term applies to any electrostatic field and any magnetic field. Flux is depicted as "lines" in a plane that contains or intersects electric charge poles or magnetic poles.

F = BA (A is cross-sectional area in square meters), F  (Webers, Wb)

4)   Field Intensity, (H)

-     The magnetic field intensity (H) is the magnetic field of an electrically charged current. The magnetic field intensity is operationally defined and measured by a long coil whose own field intensity exactly equalizes the field being measured.
   
H = NI/l (l = path length in meters), (A-t/meter)

5)   Flux Density, (B)

-    The flux density (B) is the number of magnetic lines of flux that pass through a certain point on a surface. The SI unit is T (tesla), which is Weber per square metre (Wb/m2)

B = mH, Wb/meter2

6)      Permeability, (μ)

-    Magnetic permeability (μ) is the ability of a magnetic material to support magnetic field development. In other words, magnetic permeability is the constant in the proportionality between magnetic induction and magnetic field intensity.
μ = μrμo  , Where μr is the relative permeability of the material and

μo = 4n x 10-7 H/m is the permeability of free space. 

 Define:

1) Magnetomotif Force

The magnetomotive force, mmf, is analogous to the electromotive force and may be considered the factor that sets up the flux, φ. The mmf is equivalent to a number of turns, N of wire carrying an electric current, I and has units of ampere-turns. If either the current through a coil (as in an electromagnet) or the number of turns of wire in the coil is increased, the mmf is greater; and if the rest of the magnetic circuit remains the same, the magnetic flux increases proportionally.

2) Reluctance

The reluctance of a magnetic circuit is analogous to the resistance of an electric circuit. Reluctance depends on the geometrical and material properties of the circuit that offer opposition to the presence of magnetic flux. Reluctance of a given part of a magnetic circuit is proportional to its length and inversely proportional to its cross-sectional area and a magnetic property of the given material called its permeability.

3) Flux

The magnetic flux in magnetic circuit is analogous to the electric current in electrical circuit. Just like current, flux has magnitude and direction. The direction of magnetic flux of normal permanent magnet is normally North to South direction. In electromagnetic reaction , the direction of flux can be defined using left hand rule.

4) Field Intensity

Magnetic field intensity, H is known as magnetomotive force per unit length. It is a measure of the magnetic flux strength on certain distance or length. Magnetic flux intensity diminishes with increasing distance from a straight current-carrying wire or a straight line connecting a pair of magnetic poles around which the magnetic field is stable.

5) Flux Density

Flux density (Magnetic flux density), B is the number of magnetic lines of flux that pass through a certain point on a surface of area. At a given location in the vicinity of a current-carrying wire, the magnetic flux density is directly proportional to the current, I in amperes, including the coil number of turns, N.

6) Permeability

Permeability μ is a measure of the ease by which a magnetic flux can pass through a material (Wb/Am). Permeability of free space μo = 4π x 10-7 (Wb/Am). Relative permeability μr varies depends on material used. The total permeability is calculated as μ = μr  x μo.

PART 2

the magnetomotive force (mmf) is a quantity appearing in the equation for the magnetic flux in a magnetic circuit, often called Ohm's law for magnetic circuits.It is the property of certain substances or phenomena that give rise to magnetic field

2) Reluctance

Magnetic reluctance, is a concept used in the analysis of magnetic circuits. It is defined as the ratio of magnetomotive force (mmf) to magnetic flux.

 3) Flux

the quantity which passes through a surface or substance or measurement of the total magnetic field which passes through a given area.

 4) Field Intensity

is a ratio of the MMF needed to create a certain Flux Density (B) within a particular material per unit length of that material. 

 5) Flux Density

The number of magnetic lines of flux that pass through a certain point on a surface

 6) Permeability

Is a measure of the ease by which a magnetic flux can pass through a material