A metal wire of mass m = 24.1 mg can slide with negligible friction on two horizontal parallel rails separated by a distance d = 2.56 cm as shown below. The track lies in a vertical uniform mag- netic field of magnitude B = 56.3 mT. At time t = 0, the wire is at rest and device G is connected to the rails, producing a constant current I = 9.13 mA in the wire and rails (even as the wire moves). В m d (a) Draw a diagram showing the wire, the track, and the directions of the current in the wire, the magnetic field, and the direction of the magnetic force on the wire. (b) Describe how you expect the wire to move after the current starts flowing (direction? constant or increasing velocity?). Explain your reasoning. (c) At t = 61.1 ms, what is the acceleration and the speed of the wire?

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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.