Chapter 15 - Electric Charge, Forces, and Fields - Learning Path Questions and Exercises - Conceptual Questions - Page 554: 3

When an object is charged positively, its mass decreases because it loses electrons. If an object becomes negatively charged, its mass increases as it gains electrons.

When an object is charged positively, its mass decreases because it loses electrons. If an object becomes negatively charged, its mass increases as it gains electrons.