To generate a steady B-field for our experiment, we have two options to choose from:

1. Permanent Magnets
2. Electromagnets

Before I choose a path, I'd like to do a quick study to determine the cost of building a magnet with a 1 Tesla flux density through a 1" x 1" area.  If more than 1 Tesla is needed, we can approximate the cost as a linear function of flux density.

Using Permanent Magnets:

Benefits of using permanent magnets are:

1. Different sizes, shapes, and strengths readily available
2. Stacking smaller magnets is equivalent to a single magnet of the same thickness
   1. Flux density (B) dependent on the magnet's dimension in the direction of the magnetic field's axis
3. Setup would require a simple mounting fixture

Some cons:

1. If using multiple small magnets, the B-field will not be uniform in certain places (compared to a larger permanent magnet or electromagnet) due to the gaps between the magnets.  (Not a show stopper)
2. Can get expensive as the number of magnets needed is increased to increase the B-field.

Example Jig set up:

• Using the B884-N52 rectangular magnets stacked in two rows, we can get a B-Field of ~ 1 Tesla (0.99 Tesla)
• Total cost would be ~$30.  The jig would be made from scrap wood I have laying around.

Analysis using an electromagnet coming in the next log...