A conducting rod spans a gap of length L = 0.215 m and acts as the fourth side of a rectangular conducting loop, as shown in the figure. A constant magnetic field B = 0.75 T pointing into the paper is in the region. The rod is moving under an external force with an acceleration a = At2, where A = 5.5 m/s4. The resistance in the wire is R = 125 Ω.  L = 0.215 m B = 0.75 T A = 5.5 m/s4 R = 125 Ω A.  Calculate the numerical value of I at t = 2s in A.  I(t=2s) =

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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.