Demonstrator holding a loudspeaker over a pile of nuts, showing the power of the magnet it contains as it lifts the nuts. Loudspeakers work by applying a varying electric signal to a coil of wire in the field of a permanent magnet. The varying field causes the coil to move relative to the magnet. Attached to the coil is a paper cone, whose vibrations produce sound in the air. See clip K004 2697 for the loudspeaker in action. | |
Licence : | Droits gérés |
Crédit : | Science Photo Library / RHYS LEWIS & MINH TAN PHAM, AHS, DECD, UNISA |
Model Release : | Le droit n'est pas encore disponible. Merci de nous contacter avant utilisation. |
Durée : | 13 Secondes |
Aspect ratio : | 16/9 |
Restrictions : | - |