What is the electric force between a glass ball that has +2.5 x 10^-6 c of charge and a rubber ball that has -5.0 x 10^-6 c of charge when they are separated by a distance of 0.0050 m?

As per Coulomb's law we know that force between two charges is given as

here we know that

now from above formula we will have

so they will attract towards each other as they are opposite in nature with force F = 4500 N

terd muffin is the correct answer