Why does increasing the current, increase the magnetic field of a coil wrapped around an iron ore?
Effect of iron core When the coil is wrapped around an iron core, the strength of the electromagnetic field is much greater than the same coil without the iron core. This is because the atoms in the iron line up to amplify the magnetic effect. The orientation of the atoms in the iron is called its domain. Current When you increase the current, the magnetic strength increases, but it is not exactly linear as it is with the coil by itself. The characteristics of the core cause the curve of magnetic strength versus current to be an s-shaped hysteresis curve. The shape of this curve depends on how well the material in the core becomes magnetized and how long it remains magnetized. Soft iron loses its magnetism readily, while hard steel tends to retain its magnetism.
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