Question

How many types of charged gained by rubbing objects ​

Answer 1

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In rubbing objects, only the electrons transfer. So, the answer is only 1 gained - the negative charge.

Answer 2

Answer:

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When insulating materials rub against each other, they may become electrically charged . Electrons , which are negatively charged, may be 'rubbed off' one material and on to the other. The material that gains electrons becomes negatively charged. The material that loses electrons is left with a positive charge.