Final answer:
If a negative charge instead of a positive charge were used in this problem, the electric potential energy would change sign and decrease in magnitude. The kinetic energy magnitude would also decrease.
Step-by-step explanation:
If a negative charge instead of a positive charge were used in this problem, the following changes would occur:
- Electric potential energy changes sign: The sign of the electric potential energy would change, indicating a change in the direction of the force experienced by the charge.
- Electric potential energy magnitude decreases: The magnitude of the electric potential energy would decrease, as the negative charge would experience an attractive force towards the positive charges in the system.
- Kinetic energy magnitude decreases: With a negative charge, the magnitude of the kinetic energy would decrease, as the negative charge would accelerate towards the positive charges in the system.