A point charge $Q$ is placed in uniform electric field $\vec E = E_1 \hat i + E_2\hat j$ at position $(a, b)$. Find work done in moving it to position $(c, d)$
Zero
$\{E_1(c -a) + E_2(d-b)\}Q$
$\{E_1\, ac + E_2\, bd\}Q$
$\{E_1c + E_2d\}Q$
Figure shows a charge array known as an electric quadrupole. For a point on the axis of the quadrupole, obtain the dependence of potential on $r$ for $r / a>>1,$ and contrast your results with that due to an electric dipole, and an electric monopole (i.e., a single charge).
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