Question

using coulombs law, if the size of one of the charges increased (and the distance remains the same), what happens to the electric force between them

Answer 1

If the size of one of the charges increases, the electric force between them will also increase. This is because the electric force is directly proportional to the product of the two charges. So, by increasing the size of one of the charges, the overall product of the charges (and therefore the force) will also increase.