Magnetic Field-Part I

The motions of subatomic structures produce a magnetic field, so an example of these subatomic structures would be nuclei or electrons. As electrons spin and orbit a nucleus they produce a magnetic field.

Now the direction of the spin and orbit indicate the direction of the field. Pairs of electron suspend an orbit in opposite directions cancel each other creating a net magnetic field of zero. A magnetic moment is the strength of a magnetic field.

Mini-test: MAGNETIC FIELD PART I 

Question 1: A magnetic moment is the 
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Question 2: Ferromagnetic materials have
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Next Lesson: Magnetic Field-Part II

The transcript is for your convenience.
Materials that have an unpaired electron are what we consider to be magnetic and so that brings us to three different types of material. The first is a paramagnetic material, which has a weak attractive force, then a ferromagnetic material, which has a strong attractive force and then finally diamagnetic materials, which has electrons that are paired.

Now remember a second ago we said that materials that have an unpaired electron are magnetic, well here we’re calling this diamagnetic, it has magnetic in the word yet it has paired electrons. Well, diamagnetic materials do not typically have magnetic moments. They typically do not have a magnetic field. However, there are some diamagnetic materials that have a weak magnetic field.

Next Lesson: Magnetic Field-Part II