Q4 of 9 Page 46

Consider the charges q, q and -q placed at the vertices of an equilateral triangle what is the force on each charge

The forces of attraction or repulsion between different pairs of charges are shown in the figure.


Each such force has a magnitude



Where a = side of the equilateral triangle


By the parallelogram law, the net force on the charge q1 is





Where is a unit vector along


Similarly, the total force on charge q2 is



Where is a unit vector along


The total force on charge q3 is



Where is a unit vector along the direction bisecting


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