Two coils are at fixed locations. When coil 1 has no current and the current in coil 2 increases at the rate 17.7 A/s, the emf in coil 1 is 28.2 mV. (a) What is their mutual inductance? (b) When coil 2 has no current and coil 1 has a current of 5.60 A, what is the flux linkage in coil 2?

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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.