describe reluctance as the opposition to the establishment of magnetic flux?
Just as there are electric circuits there are magnetic circuits. The source is usually a solenoid which provides a magnetomotive force measured in amp turns.The magnet flux Φ is measured in webers and is like a current in an electric circuit. ? flows through a magnetic material just like current flows through a wire. The reluctance is like a resistance (resistor) in that it limits the amount of magnetic flux in the magnetic circuit while the resistor limits current in an electric circuit. Reluctance is equal to L/((μ)(A)) where L is the length of the magnetic material, A is the area of the magnetic material and μ is the permeability of the magnetic material. Reluctance is measured in amp turns per weber.
