![]() The measurement of magnetic flux is tied to the particular area chosen. Let 21 denote the magnetic flux through one turn of coil 2 due to I1. Since the two coils are close to each other, some of the magnetic field lines through coil 1 will also pass through coil 2. For the same magnet speed, which coil produces a higher voltage With the north pole to the left and moving the magnet from right to left, a positive voltage is produced as the magnet enters the coil. When, for example, current through a coil is increased, the magnetic field and flux also increase, inducing a counter emf, as required by Lenz’s law. It is a useful tool for helping describe the effects of the magnetic force on something occupying a given area. The first coil has N1 turns and carries a current I1 which gives rise to a magnetic field B1 G. Try moving the magnet through a four-turn coil and through a two-turn coil. ![]() As we have effectively coerced the flux back to zero, we call the magnetizing force required to do this the coercivity or coercive force.Īs the current magnitude increases, the flux density also increases but with opposite sign. Magnetic flux is a measurement of the total magnetic field which passes through a given area. ![]()
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