Ferrite bar magnets for basic experiments on magnetic field lines & attraction-repulsion. Safe for children, includes lab analysis showing low to no heavy metals. Buy Indigo brand bar magnets for quality+economy.
Indigo ferrite ceramic bar magnets blue-red & stamped N-S and magnetized at the ends for repulsion-attraction. Pick up paper clips or show the shape of magnetic fields with iron filings, compasses or magnaprobes.
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Here are 3 ways to use bar magnets for in a magnetic field visualization experiment. We offer material for the first two.
What you are seeing over the bar magnet image shown below is analogous to the shape of the magnetic field around the Earth.
Put two bar magnets, as NS-NS (or SN-SN) under a petri dish. Sprinkle some iron filings over the ends of the magnets & the gap in between. Then move them towards each other & back. You should see similar magnetic field lines form in what is called superpositioning or vector addition of their respective magnetic fields.
Our blog, Ferrite Bar Magnet Experiments for Kids has additional suggestions for using bar magnets.
You can watch an older, pre HD, video of the magnaprobe in action & how it illustrates the 3D nature of magnetic fields; a great analogy for the Earth's magnetic field.
| Ferrite Cermaic Magnet Technical Specifications - C5 Grade | |||||
| Grade Name | Br (Kg) | HcB (KOe) | Hci (KOe) | BhMax (MGOe) | Tmax |
| C5 | 3.8 | 2.4 | 2.5 | 3.4 | 250oC |
These magnets are very weak so there is no danger from 2 of them coming together in an attraction experiment. There are also safe for young children, supervised of course. You can view this report on Paint Analysis that shows the levels of heavy metals are well below recommended limits.
