Determine the electric dipole moment of the syatem of three charges , placed on the verices of an equilateral triangle , as shown in the fogure :
A
`sqrt(3)ql(hatj-hati)/(sqrt(2))`
B
`(ql) (hat i+hatj)/(sqrt(2))`
C
`2qlhatj`
D
`-sqrt(3) ql hatj`
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