Since the strength of the electrostatic force decreases as distance increases, the strength of the force is lesser than that of forces and. But the charge q 3 is located farther compared to q 2 and q 4. Therefore the vectors representing these two forces are drawn with equal lengths. As a result the strengths (magnitude) of the forces and are the same even though their directions are different. The charges q 2 and q 4 are equi-distant from q 1. The following diagram shows the direction of each force on the charge q 1. Calculate the total force acting on the charge q 1 due to all the other charges.Īccording to the superposition principle, the total electrostatic force on charge q1 is the vector sum of the forces due to the other charges, The force on q 1 exerted by the charge q 3 isīy continuing this, the total force acting on the charge q 1 due to all other charges is given byĬonsider four equal charges q 1,q 2, q 3 and q 4 = q = +1μC located at four different points on a circle of radius 1m, as shown in the figure. The electrostatic force between two charges is not affected by the presence of other charges in the neighbourhood. Here ^ r 21 is the unit vector from q 2 to q 1 along the line joining the two charges and r 21 is the distance between the charges q 1 and q 2. The force on q 1 exerted by the charge q 2 The superposition principle explains the interaction between multiple charges.Īccording to this superposition principle, the total force acting on a given charge is equal to the vector sum of forces exerted on it by all the other charges.Ĭonsider a system of n charges, namely q 1, q 2, q 3 ….q n. Coulomb’s law alone does not give the answer. ![]() If there are more than two charges, the force on one charge due to all the other charges needs to be calculated. Coulomb’s law explains the interaction between two point charges.
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