4 charges are placed each at a distance 'a' from origin. The dipole moment of configuration is (...

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4 charges are placed each at a distance 'a' from origin. The dipole moment of configuration is
(A) \( 2 q a \hat{j} \)
(B) \( 3 q a \hat{j} \)
(C) \( 2 a q[\hat{i}+\hat{j}] \)
(D) none
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