First slide

Electric dipole

Question

The locus of the points (in the xy-plane) where the electric field due to a dipole (dipole axis is along x-axis and its equatorial is along y-axis) is perpendicular to its axis, is

NA

Solution

For the given points
$θ + α = π / 2 \Rightarrow α = π / 2 - θ$
$As tanα = \frac{tanθ}{2} \Rightarrow \tan (\frac{π}{2} - θ) = \frac{tanθ}{2} \Rightarrow tanθ = \sqrt{2}$

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