75mm (3") Bar Magnet

SKU: 33544

$1.40USD or lower Each

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This 75mm blue & red painted bar magnet is ideal for doing magnetic repulsion & attraction experiments; only $1.40 (buy 2 for a repulsion/attraction pair).

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

Details

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

 

Specifications
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)
2017-04-20

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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