derive an expression for ohms law in magnetic circuit
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Ohm's law for electric circuit is V = I R where V is voltage, I is current, R is Resistance. Ohm's law for magnetic circuit is MMF = Φ X S where MMF is magnetomotive force (NI) , Φ is flux, S is reluctance.
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Ohm's law states that the current through a conductor between two points is directly proportional to the voltage across the two points. Introducing the constant of proportionality, the resistance, one arrives at the usual mathematical equation that describes this relationship.
B=μH
=μoμrH
μo–permeability of free space
μr–relative permeability of material
=μoμrNIl
ϕ=B×A
ϕ=μoμrNIAl
=MMFreluc tan ce
MMF - Magnetive motive force
Hence this equation resembles I=VR=emfresis tan ce
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