two point charges of 3.4 μc and 6.6 μc are 0.20 m apart. what is the electrical potential energy of the system?

Ineed the answers for these promblems i have

The mass of the sun is 1.99×1030kg and its distance to the earth is 1.50×1011m. what is the gravitational force of the sun on the earth?

Which best describes what forms in nuclear fission? a. two smaller, more stable nucleib. two larger, less stable nucleic. one smaller, less stable nucleusd. one larger, more stable nucleus