Determine the electric dipole moment of the system of the three charges, placed on the vertices of an equilateral triangle, as shown in the figure :

Question

$2q\ell \widehat j$

$\left( {q\ell } \right){{\widehat i + \widehat j} \over {\sqrt 2 }}$

$\sqrt 3 \,q\ell {{\widehat j - \widehat i} \over {\sqrt 2 }}$

$ - \sqrt 3 \,q\ell \widehat j$

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