In which of the following pairs of substances will there be a net attractive electrostatic force?
A)Two positively charged table tennis balls
B)A negatively charged piece of dust and a positively charged piece of dust
C)A positively charged sodium ion and a positively charged potassium ion
D)A negatively charged chloride ion and a negatively charged bromide ion
E)Two negatively charged pith balls

Question

Quizplus · Accepted Answer

Opposite charges attract each other, so the negatively charged piece of dust and positively charged piece of dust will have a net attractive electrostatic force. The other options all contain two objects with the same charge, so they will have a net repulsive force.

In Which of the Following Pairs of Substances Will There