How Do You Solve an Electrostatic Force Equation?

Solving for the electrostatic force requires the use of Coulomb's Law, which is shown in the following equation: F = K(q1*q2)/d^2. The electrostatic force is the force that two electric charges exert on one another. It is an important concept in the physics of electricity. This force is exerted by each charge on the other, the only difference is the direction.

  1. Determine the charge on the two particles

    Find the magnitude of both charges in the given problem. In Coulomb's Law, these charges are represented by "q1" and "q2." The unit of measure for these charges is the coulomb (C).

  2. Find the distance between the charges

    Determine the distance between the charges from the given problem. In Coulomb's Law, the "d" represents the distance between the two charges. If you must measure the distance between charges, it does not matter which charge you begin to measure at. Typically, nanometers (nm) are used for measuring this distance.

  3. Insert the value for the constant and solve

    Insert the constant value for "K" into the given equation. "K" is Coulomb's constant, which is equal to 9 x 10^9 Nm^2/C^2. Insert these values into Coulomb's Law and solve for the force. Newton is the measuring unit of force.