The net force on charge -3Q and charge 4Q is the vector sum of the individual forces acting on each charge. It takes into account both the direction and magnitude of each force.
To calculate the net force on two charges, you first need to find the individual forces acting on each charge using Coulomb's Law. Then, you can use vector addition to find the total force by adding the individual forces in the x and y directions.
The magnitude and direction of the net force on two charges is affected by the distance between the charges, the magnitude of the charges, and the medium in which the charges are located. Additionally, the direction of the net force depends on the relative positions of the two charges.
Yes, the net force on two charges can be zero if the charges are equal in magnitude and opposite in direction, or if they are placed at equal distances from a third charge.
As the distance between two charges increases, the magnitude of the net force decreases. This is because the electric force between two charges is inversely proportional to the square of the distance between them. The direction of the net force remains the same as long as the relative positions of the charges do not change.