The dipole moment $\vec p$ of a pair of charges $+q$ and $-q$ separated by $2\ell$ is directed:
AFrom $-q$ to $+q$
BAlong the equator of the dipole
CPerpendicular to the line joining them
DFrom $+q$ to $-q$
Answer & Solution
Correct answer: A. From $-q$ to $+q$
By convention $\vec p$ points from the negative charge to the positive charge and has magnitude $p = q \cdot 2\ell$. The equator is perpendicular to $\vec p$.
Related questions
If a positive point charge is placed at the centre of a spherical conducting shell of radiThe SI unit of electric field isFor a charge distribution with volume density ρ, the total charge Q equalsThe electric flux through a closed surface enclosing a charge of +5 μC is (ε₀ = 8.85 × 10⁻Two charges +q and −q of equal magnitude are placed at the corners A and B of an equilaterThe principle of quantisation of electric charge is stated asAn electric dipole in a uniform electric field E experiencesThe electric field on the axial line of a short electric dipole at distance r is