Testing for magnetic properties. A bar magnet separates different materials. It attracts steel paper clips but does not affect plastic paper clips. | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / Giphotostock |
Taille de l’image : | 3435 px × 5157 px |
Model Release : | Non requis |
Property Release : | Non requis |
Restrictions : | - |