What is the use of pith balls?

Pith balls are lightweight, small spheres made from the pith of certain plants, commonly used in physics experiments to demonstrate electrostatic principles. When charged, pith balls can illustrate attraction and repulsion between charged objects, helping students visualize electrostatic forces. They are also used in experiments to show the effects of electric fields and to study the behavior of charged particles. Overall, pith balls serve as simple tools for educational demonstrations in electrostatics.