Remagnetising school magnets
From old to new - Cheap revival of magnets
Online since: 07/12/2012,
Number of visits: 530172
Scholastic physics collections
Especially physics teachers will appreciate this application "Revival of old school magnets": Many physics collections in schools contain magnets that have lost their adhesive force over time. Buying new ones would be expensive, but you can use small and affordable super magnets to revive the old ones. How that works is explained below:
An old disused magnet
The flux density of these senile school magnets is only 14 mT (millitesla). Half a year before it was still 22 mT.
A relatively new magnet
This 6-month old magnet still has a magnetic flux density of 51 mT. Initially it was 100 mT.
Revival of old magnets
In order to revive older magnets we did the following: We placed 2 block magnets Q-10-05-03-N on each of the two pole surfaces and glued them on with an adhesive. (The super magnets also work on cylindrical and horseshoe magnets.)
The paperclip test
The result is illustrated by the paperclip test: The revived magnet on the right attracts visibly more paperclips than the older magnet on the left. The amount of paperclips near the pole is more significant than the length of the paperclip chain.
An amazing measurement
A quick measurement confirms: Instead of the original 14 mT the magnet now has more than 306 mT. Mission accomplished!Articles used
Load...
Block magnet 10 x 5 x 3 mm, holds approx. 1,5 kg, neodymium, N45, nickel-plated
| 10 pcs. | 0,57 EUR ea.* | |
| from | 40 pcs. | 0,47 EUR ea.* |
| from | 80 pcs. | 0,43 EUR ea.* |
| from | 160 pcs. | 0,39 EUR ea.* |
| Ask for a rebate from 750 pcs. | ||
Available: 53 910 pcs.
magnet glue, waterproof, without solvents, shelf life of 24 months, 20 g tube
To glue on super magnets
To glue on super magnets
| 1 pc. | 7,95 EUR ea.* (397,50EUR/kg) |
Available: 1 975 pcs.
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