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  4. Electric charges q . q,-2 q are placed at the corners of an equilateral triangle A B C of side l. The magnitude of electric dipole moment of the system is

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Q. Electric charges $q . q,-2 q$ are placed at the corners of an equilateral triangle $A B C$ of side $l$. The magnitude of electric dipole moment of the system is

Electric Charges and Fields

Solution:

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$p_{\text {net }}=\sqrt{p^{2}+p^{2}+2 p p \cos 60^{\circ}}$
$=\sqrt{3} p=\sqrt{3} q l (\because p=q l)$