A long, straight wire carrying a current of 3.31 A moves with a constant speed v to the right. A 5-turn circular coil of diameter 12.5 cm, and resistance of 3.25 µΩ, lies stationary in the same plane as the straight wire. At some initial time the wire is at a distance d = 8.65 cm from the center of the coil. 5.11 s later, the wire is at a distance 2d from the center of the coil. What is the magnitude and direction of the average induced current in the coil?

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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.