Ebonite friction rods are useful for electrostatic experimentation, and can be used for charging electroscopes.
Specifications
Rod Length: 11.75 Inches / 30cm
Rod Diameter: 1/2" / 12mm
Specifications
Rod Length: 11.75 Inches / 30cm
Rod Diameter: 1/2" / 12mm
Reviews
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Charge Polarity
The Ebonite rod charges minus. A glass test tube charges plus. But that is only with some kinds of rubbing cloth. It is really useful to find the right combination of cloth and solid object material to have both plus and minus. (Which can be revealed with an electrometer.)