If we have two charges, q one and Q two, if we multiply them together and multiplied by the constant k and divided by the distance between their center of charges squared, we get the force that each charge feels due to the other charge. Remember, plus charges repel and plus and minus attract. So notice what we have here. The charge in this nucleus is the same as the charge in this nucleus because we have the same amount of protons in those nuclei. And we both have one electrons, one electron here and one electron here. And they also have the same amount of charge.