Q. 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
Explanation
(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
$E = \frac{1}{4\pi\varepsilon_{0}}\frac{2p}{r^{3}}$
Where p is dipole moment.
[image:1_image305.emf]
The direction of electric field E is along the axis of the dipole from negative charge towards positive charge.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.