Shown below is a conducting rod that slides along metal rails. The apparatus is in a uniform magnetic field of strength 0.5 T, which is directly into the page. The rod is pulled to the right at a constant speed of 4.5 m/s by a force F→. The only significant resistance in the circuit comes from the 2-Ω resistor shown. (a) What is the voltage induced in the circuit? (b) What is the induced current? (c) What is the magnitude of F→?

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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.