First slide

Electric dipole

Question

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

Easy

A

Zero
B

$\sqrt{2} \times 10^{- 8} C.m$
C

$2 \sqrt{2} \times 10^{- 8} C . m$
D

$2 \times 10^{- 8} C . m$

Solution

$\vec{p} = \sum q_{i} \vec{r_{i}}$ 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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