In physics, 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.[1] It is the property of certain substances or phenomena that give rise to magnetic fields:
where Φ is the magnetic flux and R is the reluctance of the circuit. It can be seen that the magnetomotive force plays a role in this equation analogous to the voltage V in Ohm's law: V = IR, since it is the cause of magnetic flux in a magnetic circuit:[2]
- where N is the number of turns in the coil and I is the electric current through the circuit.
- where Φ is the magnetic flux and R is the magnetic reluctance
- where H is the magnetizing force (the strength of the magnetizing field) and L is the mean length of a solenoid or the circumference of a toroid.
https://en.wikipedia.org/wiki/Magnetomotive_force
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