The current to an inductor with 25 windings and a cross sectional area of .025m^ 2 is increased such that the energy stored in the magnetic field increases by a factor of 9. Find the factor by which the current increased. Show the algebraic form of the equation(s) that you apply and report findings with the correct units and number of significant figures.

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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.