Question

In step 1, the insulating plate (such as plastic) becomes positive charged when rubbed with cloth. what is the name of this phenomenon?

Answer 1

An insulating plate, such as plastic, tends to be positively charged when rubbed with cloth due to the piezoelectric effect. This phenomenon involves certain materials to generate charged particles as a response to mechanical stress applied to it. In this case, the mechanical stress was due to the rubbing motion.