The 120mm (5") bar magnet is great for experiments with iron filings, compasses or paperclips-only $1.30..
See our blog on Magnet Experiments for Kids for more information and ideas.
If you need bar shaped magnets with greater holding or repelling force, see: neodymium magnet blocks.
Note:The bar magnets got a big boost by attaching 20x10x5mm Nd blocks at opposing faces.
Or, take a look at this really old video of a magnaprobe in action that shows how to identify a magnetic field around a bar magnet.
Two 120x22x10mm bar magnets were placed in contact with opposing poles (N:N). They were released and the repulsion distance was measured. The average of 5 trials is 52mm or slightly more than 2 inches. See video below.
|Trial 1||Trial 2||Trial 3||Trial 4||Trial 5||Average|
Forty paper clips were placed in a 500ml beaker. A single 120x22x10mm ferrite bar magnet was dipped into the beaker to pick up as many paper clips as possible. See video below.
|Type||Trial 1||Trial 2||Trial 3||Trial 4||Trial 5||Average|
|Plastic Coated Steel||19||19||12||17||20||17|
Note, there is no audio track.
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