One ball has a positive charge, the other negative. How will the mass of the balls change after they touch?

When in contact, the excess of electrons from the negatively charged ball will go to the ball with a positive charge. Due to this, the mass of the ball, which had a negative charge, will decrease, and the mass of the ball, which was positively charged, will decrease. Since the mass of the electrons is very small, the change in mass will be negligible.



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