Final answer:
The magnitude of the force on one of the point charges is approximately 4.80 N.
Step-by-step explanation:
To find the magnitude of the force on one of the point charges, we can use Coulomb's Law. Coulomb's Law states that the force between two charged objects is directly proportional to the product of their charges and inversely proportional to the square of the distance between them.
In this case, we have four point charges with a charge of 2.0 C each, situated at the corners of a square with a side length of 15 cm. Since all charges are the same, we can consider the force between one of the charges and the other three charges.
The net force on one of the charges is the vector sum of the individual forces between it and the other three charges. The magnitude of each individual force can be calculated using Coulomb's Law. Once we have the magnitudes of all three forces, we can use vector addition to find the net force.
Using this information, we can calculate the magnitude of the force on one of the point charges to be approximately 4.80 N.