This 75mm blue & red painted bar magnet is ideal for doing magnetic repulsion & attraction experiments; only $1.35 (buy 2 for a repulsion/attraction pair).
See our blog on Magnet Experiments for Kids for more information and ideas.
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 |
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 |
| P/N | Description | QTY |
|---|---|---|
| 43800 | Electric Circuits & Bar Magnets Demo Kit | 2 |
| 33545-SP1 | Bar Magnets, Filings, Petri Dishes | 20 |
Good strong magnet, not recommended for kids as they break easily when dropped.
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Yes, brittleness is their main drawback. But, dirt cheap compared to AlNiCo.