For a solenoid in vacuum of length l = 10 cm with 104 turns per meter calculate the current required to create the field B = 70 µT. Calculate the value of the current if the solenoid is placed in an external uniform magnetic field Bext = 35 µT with field lines exactly opposite to the field produced by the solenoid. Take vacuum permeability µ0 = 4π × 10−7 H

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Q: First Question

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Q: In a solenoid of length l = 10 cm with 4449 turns per meter the current creates the field B = 70 μT.…

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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.