Question:In Example 21.4, what is the net force (magnitude and direction) oncharge q1exerted by the other two charges?Answer :The electrostatic repulsive or attractive force is directly proportionalto the product of the two charges and inversely proportional to thesquare of the distance.

Here,kis the Coulombâ€™s constant,qis the charge, andris thedistance.The free body diagram for the chargeis,The magnitude of force ondue toQis,Substitutefork,for,forQ, and 0.5 m forrin the above equation.

The vector form of the force is,From the figure,Substitutefor,for, andforin the.Force ondue tois as follows:Substitutefork,for,for, and 0.6 mforrin the above equation.