Problem 30.31: Figure below is a cross-sectional view of a coaxial cable. The center conductor is surrounded by a rubber layer, an outer conductor, and another rubber layer. In a particular application, the current in the inner conductor is /1=1.00 A out of the page and the current in the outer conductor is /2=3.00 A into the page. Assuming the distance d = 1.00 mm, determine the magnitude and direction of the magnetic field at point a. A) 20 µT toward top of page B) 20 µT toward bottom of page C) 200 µT toward top of page D) 200 µT toward bottom of page

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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.