State and explain Ohm's law for 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.

The voltage is analogous to magnetomotive force, current is analogous to flux, resistance is analogous to reluctance.

The voltage or EMF is the force behind the flow of electrons while the MMF is the force behind the flow of magnetic flux. Electric current is the flow of electrons while the magnetic flux is total number of magnetic lines of force. Resistance is the opposition to the flow of current while reluctance is the opposition to the flow of magnetic flux.
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