The force of attraction or repulsion for each pair of charges has the
same magnitude F
q
=
2
0
2
4 π ε l
The total force F2 on charge q at B is thus F2 = F ˆr 2, where ˆr 2 is a
unit vector along AC EXAMPLE 1 6
Rationalised 2023-24
14
Physics
 EXAMPLE 1 6
Similarly the total force on charge –q at C is F3  = 
3  F ˆn , where ˆn is
the unit vector along the direction bisecting the ÐBCA