Question

The electric field intensity $\vec{E}$, due to an electric dipole of moment $\vec{p}$, at a point on the equatorial line is

• A. parallel to the axis of the dipole and opposite to the direction of the dipole momen $\vec{p}$
• B. perpendicular to the axis of the dipole and is directed away from it
• C. parallel to the dipole moment
• D. perpendicular to the axis of the dipole and is directed toward it

Answer 1

The Correct Option is A

Consider an electric dipole consisting of two point charges $-q$ and $+q$ separated by a small distance $A B=2 \,a$ with centre at $O$, As shown in figure, on equatorial line, the resultant electric field $\vec{ E }$ of $\vec{ E }_{1}$ and $\vec{ E }_{2}$ is parallel to the axis of the dipole but opposite

to the direction of the dipole moment $\vec{ p }$ as it is directed from negative charge to positive charge.