Question

Electric field strength due to a dipole at a point on the axial line of dipole is

• A. from positive charge to negative charge
• B. from negative charge to positive charge
• C. along the equatorial line
• D. at an angle to axial line

Answer 1

Answer: (B)

For a dipole having two charges $+q$ and $-q$ separated at a distance $2l$, the intensity of electric field at an axial point $P$ is given by $E=\frac{1}{4\pi {\epsilon }_0}\frac{2p}{r^3}$ where $p$ is dipole moment.
The direction of electric field $E$ is along the axis of the dipole from negative charge towards positive charge.