You want to make a solenoid of radius r and length l out of a piece of copper wire of resistance R, length L, and diameter D, that you already have, and power it with a battery of voltage V that you also already have. The solenoid must be wrapped N times around a cylinder without overlapping turns. What is B (an equation) inside the solenoid going to be based on V, L, D, N (turns), R, r, l, and any other parameters - geometric or otherwise that you need?

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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.