An average human weighs  about 600 N.  If each of two average humans could carry 2.5 C of excess charge, one positive and one negative, how far apart would they have to be for the electric  attraction between them equal their 600 N  weight?

How many electrons must be removed from each of two 5.2 kg copper spheres to make the electric force of repulsion between them equal in magnitude to the gravitational attraction between them?

Two engineering students, John with a mass of 85 kg and Mary with a mass of 42 kg, are 93 m apart. Suppose each has a 0.01% imbalance in the amount of positive and negative charge, one student being positive and the other negative. Find an approximation of the electrostatic force of attraction between them by replacing each student with a sphere of water having the same mass as the student.

Two engineering students, John with a mass of 95 kg and Mary with a mass of 60 kg, are 64 m apart. Suppose each has a 0.01% imbalance in the amount of positive and negative charge, one student being positive and the other negative. Find an approximation of the electrostatic force of attraction between them by replacing each student with a sphere of water having the same mass as the student.