Question

The electric field at a point due to an electric dipole, on an axis inclined at an angle $q(<{90}^o)$ to the dipole axis, is perpendicular to the dipole axis, if the angle $q$ is

• A. ${\tan }^{-1}\left(2\right)$
• B. ${\tan }^{-1}\left(\sqrt{2}\right)$
• C. ${\tan }^{-1}\left(1/\sqrt{2}\right)$
• D. Zero

Answer 1

The correct option is C ${\tan }^{-1}\left(1/\sqrt{2}\right)$

For the perpendicularity to the dipole axis, if the angle $q$ ${\tan }^{-1}\left(\frac{90}{2}\right)$

${\tan }^{-1}(={45}^0)$

$={\tan }^{-1}\left(1/\sqrt{2}\right)$