Magnetomotive force

In physics, the magnetomotive force is a quantity appearing in the equation for the magnetic flux in a magnetic circuit, sometimes known as Hopkinson's law. 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:[1]

  1. = NI
    where N is the number of turns in the coil and I is the electric current through the circuit. Sometimes the unit of gilbert is used to express ℱ.
  2. = ΦR
    where Φ is the magnetic flux and R is the reluctance
  3. = HL
    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

Notes

  1. Smith, R.J. (1966), Circuits, Devices and Systems, pp 495-506, Wiley International Edition, New York.

References

This article is issued from Wikipedia - version of the 5/29/2016. The text is available under the Creative Commons Attribution/Share Alike but additional terms may apply for the media files.