Which of the following correctly compares the magnitude of the gravitational force and the magnitude of the electrostatic force exerted between two electrons?
1) The gravitational force is greater than the electrostatic force.
2) The electrostatic force is greater than the gravitational force.
3) The gravitational force and the electrostatic force are equal.
4) The magnitude of the gravitational force and the magnitude of the electrostatic force cannot be compared.