An electromagnet is placed at the center of a stretched wire and connected to a signal generator to produce several modes of oscillations. The tension is changed on a wire carrying AC in the field of a magnet and the fundamental and various harmonics are shown. Use iron wire and an electromagnet or AC current and a magnet to generate standing waves in wire. A long rubber tube driven by a variable speed motor. The same motor drives two horizontal strings and one vertical string of equal length.
All strings are in resonance.
3B22.21 air driven rubber tube 18-5.3 Standing waves are produced in a stretched rubber tube by a jet of air. A weighted rubber tube is hung horizontally from the ends of short pivoted and counterweighted bars. Friction adjustments at the pivots allow any amount of energy to be absorbed. When driven from one end, many wave properties may be shown. 3B22.25 stroboscopic projection with wire 18-5.11 Waves in a wire are stroboscopically projected.