Final answer:
The force on a negative charge moving at an upward angle to the north with the magnetic field pointing north will have a southward and upward component. This is determined using the right-hand rule for negative charges.
Step-by-step explanation:
The direction of the magnetic force on a negative charge moving at an upward angle to the north, while the magnetic field points to the north, can be predicted using the right-hand rule for a negative charge or the left-hand rule for a positive charge. In this particular scenario, the force is initially towards the direction opposite of that experienced by a positive charge moving in the same direction. Since a positive charge moving due west in a region where the Earth's magnetic field is due north experiences a force straight down, a negative charge would experience a force straight up.
However, if the negative charge is also moving upwards, we have to consider the angle of motion. The upward movement indicates a velocity component that is orthogonal to the magnetic field, resulting in a force direction perpendicular to both the velocity and the field. The force on the negative charge moving upward at an angle will be southward and upward. This is because the magnetic force acts perpendicular to both the direction of the charge's velocity and the magnetic field.