Not quite sure how to calculate it A solenoid has an iron core inserted into it,

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Not quite sure how to calculate it

A solenoid has an iron core inserted into it, so that the core fills the space inside the solenoid. The magnetic properties of each iron atom may be considered to be caused by the intrinsic magnetic moment of two of the electrons, with their spins aligned parallel. Suppose that the magnetic moments of all these electrons in the iron core are perfectly aligned parallel to the field of the solenoid. By what ratio is the field inside the solenoid increased by the addition of the iron core? Does your answer depend on the size of the solenoid? Let n equal to 4000 turns per meter and the current, I, equal 2.0 A. The density of iron is 7.9 g/cm3, and the gram atomic weight(GAW) is 56. (Hint: The number of iron atoms per cubic meter = [density][Avogadro's number]/[GAW]).

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