a) The figure below shows a coil of wire that has 4 turns and an area of 1.6cm². It moves through a magnetic field of 5T, as shown below, and leaves the field over a time interval of 0.25s. Calculate the induced e.m.f within the wire. b) The same coil of wire is now dropped through the magnetic field, as shown below. It leaves the magnetic field within a time interval of 0.25s. Calculate the induced e.m.f in this situation. 100

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Ferromagnetism

Ferromagnetism is a mechanism by which some materials show magnetic properties. Iron and magnetite, an oxide of iron, are two naturally occurring materials that show the property of ferromagnetism. The word ferromagnetism is derived from the Latin name of iron, "Ferrum" as it was the first observed material to show such property. The property of ferromagnetism is shown by only a few substances such as iron, nickel, cobalt, and their alloys. Some transition metals and alloys of rare-earth metals also show ferromagnetism.