120mm (5") Bar Magnet

SKU: 33543

$1.40USD 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 $1.40..

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.

  • Use for repulsion-attraction
  • Will not demagnetize when pushed together
  • Stamped "N" & "S" & painted red & blue respectively
  • Paint is guaranteed lead & heavy metal free
  • Will pick up minimum of 20 uncoated paperclips
  • Note (1): Ferrite bars are fragile/brittle. Do not drop on hard floors.
  • Note (2): Ferrite bars are relatively weak & will not magnetize nails or pins. Stronger magnets such as Nd or Alnico are best for this application.
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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