Electric dipole

Question

Four point charges $1\mu C,-2\mu C,3\mu C$ and $-2\mu C$ are arranged on the four vertices of a square of side 1 cm. The dipole moment of this charge assembly is

Easy

Solution

$\overrightarrow{\mathrm{p}}=\sum {\mathrm{q}}_{\mathrm{i}}\overrightarrow{{\mathrm{r}}_{\mathrm{i}}}$ we can rearrange the charges to form three dipoles with charges as (-2 and +2) ,(+1 and _1) and (-1 and +1) with first and third in opposite direction and second one is perpendicular to them.

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