120mm (5") Bar Magnet

SKU: 33543

$1.30USD or lower Each

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[5]   2 Reviews    | Write a Review

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.

Details

If you need bar shaped magnets with greater holding or repelling force, see: neodymium magnet blocks.

Watch Indigo Magnet Surfer Guy go on a wild ride:

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.

Specifications

Repulsion Test

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
50mm 53mm 56mm 55mm 55mm 52mm

Paperclip Pickup Test

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
Uncoated Steel 38 38 40 36 35 37
Plastic Coated Steel 19 19 12 17 20 17

Magnet Experiment Video

Note, there is no audio track.

Reviews (2)
2017-08-15
This pair of bar magnets is polarized on the narrow ends and effective in traditional, simple experiments with magnetism and electro-magnetic induction using coils. Beware of other magnets for sale on the Internet that appear to be a traditional bar, but whose poles are on the long side of the bar and not the narrow ends.
— John
2017-04-20
Excellent product! We used them for experiments with kids and they each held a chain of at least 15 paper clips. Made our experiment come to life and the teaching element was awesome. BEST MAGNETS OUT THERE!
— Janelle
— Indigo: Hope they were plastic coated paper clips or we'll have to retest!
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