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These magnetic field windows contain magnetic powder in a water based solution for showing magnetic field patterns.
When a magnet is present the particles of iron inside become slightly magnetised, so they attract each other and cluster into the lines that show the magnetic field patterns
Size 225 x 130 x 15mm
Includes 2x plastic cased magnets, 2x ferrite magnets and an information/instruction booklet
Available with white background (06-0680) or transparent background (06-0282) for use with an overhead projector