Magnetomotive force
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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:
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.
Magnetomotive force is analogous to electromotive force, emf (= difference in electric potential, or voltage, between the terminals of a source of electricity, e.g., a battery from which no current is being drawn) since it is the cause of magnetic flux in a magnetic circuit:[1]
- ℱ = NI
- where N is the number of turns in the coil and
-
- I is the electric current through the circuit
-
- where N is the number of turns in the coil and
- ℱ = ΦR
- where Φ is the magnetic flux and
-
- R is the reluctance
-
- where Φ is the magnetic flux and
- ℱ = HL
- where H is the magnetizing force (the strength of the magnetizing field) and
Notes
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References
- The Penguin Dictionary of Physics, 1977, ISBN 0-14-051071-0
- A textbook of Electrical Technology, 2008, ISBN 81-219-2440-5
- Smith, R.J. (1966), Circuits, Devices and Systems, Chapter 15, Wiley International Edition, New York. Library of Congress Catalog Card No. 66-17612it:Forza magnetomotrice
- ↑ Smith, R.J. (1966), Circuits, Devices and Systems, pp 495-506, Wiley International Edition, New York.