How can I find the net electric force?

The superposition principle determines net electric force.

The force that one charge exerts on another is independent of the presence of other charges in the vicinity; the electric field on one charge resulting from multiple other charges is just the vector sum of forces resulting from individual charges.

To find the net electric force acting on a charged object, you need to consider the forces exerted by all other charged objects in the vicinity. The net electric force can be calculated using Coulomb's law, which states that the magnitude of the electric 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.

The formula for Coulomb's law is:

[ F = k \times \frac{q_1 \times q_2}{r^2} ]

Where:

• ( F ) is the magnitude of the electric force,
• ( k ) is Coulomb's constant ((8.9875 \times 10^9 , \text{N m}^2/\text{C}^2) in vacuum),
• ( q_1 ) and ( q_2 ) are the charges of the two objects,
• ( r ) is the distance between the centers of the two charged objects.

To find the net electric force on a charged object, you calculate the electric force between it and each other charged object nearby using Coulomb's law, and then sum up all these individual forces. Remember to consider the direction of each force, as they can be attractive or repulsive depending on the signs of the charges involved.