Q. 4

Consider the char

Answer :

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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