Visualizing Magnetic Fields in 3-D

Magnetic (and electric) fields are often challenging to teach and understand because they exist in three dimensions. Typical introductory science textbooks will usually present only 2-D images, and one of the first experiences children have with magnets usually involves dropping iron filings over a 2-D paper sheet placed on top of a bar magnet. More adventurous teachers might encourage their students to see the 3-D fields by directly dipping a strong magnet into the iron filings or making a magnetic field bottle composed of oil and iron filings so that the field of a magnet placed on the surface of the bottle can be visualized inside of the bottle. One particularly fun approach is to submerg

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