The equation for the magnetic flux in a magnetic circuit, sometimes known as Hopkinson's law, is:
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: m m f = NI where N = no of turns in the coil, I = electric current through the circuit
2: m m f = ΦR where Φ = magnetic flux R= reluctance
3: m m f = Hl where H = magnetizing force l = mean length of solenoid,circumference of toroid
- The Penguin Dictionary of Physics, 1977, ISBN 0-14-051071-0
- A textbook of ELECTRICAL TECHNOLOGY,2008,ISBN 81-219-2440-5