a solenoid with a cross-sectional of 5cm^2 has 1000 turns and is 35 cm long. a second coil is wrapped around it and has 400 turns with the same length and area. (a)what is the mutual inductance of each inductor? (b)if the current increases from 15A to 35A in 200 microseconds, what is the emf induced in the second coil? (c)If a constant current of 25A flows through the first coil, what is the magnetic flux that passes through the second coil

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Q: calipers,

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A:

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.