Question

1. What happens to the kinetic and potential energy as two electrons move closer to one another? A:
2. Is the force between an electron and a proton as they come closer together attractive or repulsive? A:
3. When two bar magnets are placed end-to-end they repel each other. What does that tell us about their charges? A:
4. What is Coulomb's law? A:

one sentences each

Answer 1

1. A: As two electrons move closer, their electrostatic potential energy increases (U ∝ 1/r for like charges); kinetic energy decreases if they are forced together (but would increase if released and allowed to convert potential energy into motion).
2. A: The force between an electron and a proton is attractive (opposite charges attract).
3. A: Repulsion between bar magnets placed end-to-end means like magnetic poles are facing each other (it says nothing about electric charge).
4. A: Coulomb's law states that the electrostatic force between two point charges is F = k q1 q2 / r^2, directed along the line joining them and proportional to the product of the charges and inversely proportional to the square of their separation.