Q. 183.9( 10 Votes )

A. Derive the exp

Answer :

A) The point P on the equatorial line is considered,


So, the magnitude electric field at P due to +q is,



And that due to -q is,



The net electric field is,



As shown in the diagram, where is the unit vector along the dipole axis (from -q to +q),


Hence,



For large distances (r >> a), the above equation reduces to,



Also, we know that,



Thus, finally the electric field on the equatorial line of the dipole is,



B) When a dipole is placed in uniform external electric field, it is stable when it is parallel ( = 0) to the electric field and unstable when it is anti-parallel ( = 180) to the electric field as shown,



Rate this question :

How useful is this solution?
We strive to provide quality solutions. Please rate us to serve you better.
Try our Mini CourseMaster Important Topics in 7 DaysLearn from IITians, NITians, Doctors & Academic Experts
Dedicated counsellor for each student
24X7 Doubt Resolution
Daily Report Card
Detailed Performance Evaluation
caricature
view all courses
RELATED QUESTIONS :

A. Derive the expPhysics - Board Papers

(a) Draw the equiPhysics - Board Papers

Two charges –q eaPhysics - Exemplar

Assume that each HC Verma - Concepts of Physics Part 2

Consider a regionPhysics - Exemplar