A conducting rod with length L = 20 cm is being pulled along a long rotated U-shape conductor, with negligible resistance, as shown in the figure below. The magnetic field in the figure has a constant value of 30 mT and the constant velocity at which the vertical rod is being pulled is 4.50 m/s. Given that the vertical conducting rod has a resistance of 7 Ω, find the minimum rate of energy input to the system to keep the rod moving at constant velocity?

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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.