Two objects, A and B, are rubbed together. As a result, object A acquires an excess negative charge while object B becomes positively charged. In comparison to their masses before the charging process, you can say that

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When two objects are rubbed together and one becomes negatively charged, it gains electrons, thus increasing its mass slightly. The other object loses electrons and becomes positively charged, resulting in a slight decrease in its mass.

Two Objects, a and B, Are Rubbed Together