Pith Balls -HLSI
A small ball or pellet of pith. Such balls suspended by a silk thread are used in an electroscope.Pith balls with positive, negative, or no electrical charge are suspended from strings. The charge and mass of the pith balls can be adjusted, along with the length of the string, which will cause the pith balls to change position. Distances can be measured as variables are adjusted, and the forces acting on the balls can be displayed.
A pack of 12 in plastic case.
Lightweight pith balls help to show electrostatic attraction and repulsion.