As a summer intern at a research lab, you are given a long sc that has two separate windings that are wound close together same direction, on the same hollow cylindrical form. You mus determine the number of turns in each winding The solenoid length L = 39.0 cm and diameter 2.80 cm You let a 2.00-mA current flow in winding 1 and vary the current I in w both currents flow in the same direction. Then you measure th magnetic-field magnitude B at the center of the solenoid as a of I You plot your results as BL/ug versus I The graph in shows the best-fit straight line to your data

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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.