A circular coiVhas a radius of 10 cm and 50 turns are rotated about its vertical diameter in a uniform magnetic field of 0.6 T. If the instantaneous value of the induced Electromotive Force (EMF) when the coil is at position 40° is 228.4 V. Determine: (i) the rotation of the coil in rpm , the maximum EMF produced and the time it takes to complete 1 revolution

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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.