This is quoted from my textbook.

I saw plastic objects before being able to store excess charges.

For example, if you rub paper against a plastic pole. Both will gain charges.

But in lab, I never saw people using plastic sphere as point source of charge or plastic plates to create uniform electric field.

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Well, insulators can store charge. It is just very difficult to get a noticeable amount of charge into an insulator, since they do not conduct electricity very well..

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  • $\begingroup$ Indeed, "conductors" and "insulators" are a judgment of degree, rather than absolute qualities. $\endgroup$ – Steve Feb 1 '18 at 7:44

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