75mm (3") Bar Magnet

SKU: 33544

$0.35USD or lower Each

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Price for each$0.35USD$0.30USD
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[4]   1 Reviews    | Write a Review

This 75mm blue & red painted bar magnet is ideal for doing magnetic repulsion & attraction experiments. Special pricing in effect, now only $0.35 (buy 2 for a repulsion/attraction pair).

See our blog on Magnet Experiments for Kids for more information and ideas.


Repulsion Test

Two 75x18x6.5mm bar magnets were placed in contact with opposing poles (N:N). They were released & the distance caused by the repulsive force was measured.

Trial 1 Trial 2 Trial 3 Trial 4 Trial 5 Average
46mm 44mm 43mm 42mm 44mm 44mm


Paperclip Pickup Test

Forty paper clips were placed in a 500ml beaker. A single 75x18x6.5mm ferrite bar magnet was dipped into the beaker to pick up as many paper clips as possible.

Type Trial 1 Trial 2 Trial 3 Trial 4 Trial 5 Average
Uncoated Steel 19 18 21 28 22 22
Plastic Coated Steel 13 11 13 9 9 11


In Kits
33545-SP1Bar Magnets, Filings, Petri Dishes20
If you need bar shaped magnets with greater holding or repelling force, see: neodymium magnet blocks.
  • 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.
Reviews (1)

Good strong magnet, not recommended for kids as they break easily when dropped.

— Indigo:

Yes, brittleness is their main drawback. But, dirt cheap compared to AlNiCo.

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