PIRA: 5A10.10



  • Braun electroscope
  • Pith ball electroscope
  • projection electroscope
  • friction rods
  • Pieces: wood, silk, chamois, and fur


  1. Rub rod using fur, silk, or wool to give it a charge. Glass rubbed with silk takes on a positive charge as the silk removes electrons from the glass. Amber becomes negatively charged as it strips electrons from fur.
  2.  Hold rod close to the electroscope receiver and watch the leaves separate