You can trace out the eld pattern of a magnet with iron
Chapter 19, Problem 19.74(choose chapter or problem)
You can trace out the eld pattern of a magnet with iron lings. Any machine shop will supply the lings, which should be soaked in a soap solution to remove grit and oil and then dried. Scatter them lightly over the surface of a paper covering the magnet, and then tap the paper gently to jar the lings into alignment. Explain why the lings form their pattern. Examine the eld pattern set up in the following situations: (a) Arrange two bar magnets about 4 cm apart, aligned with opposite poles facing each other. (b) Use two bar magnets about 4 cm apart, aligned with like poles facing each other. (c) Use a horseshoe magnet.
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