Q. Three point charges $+ q, - 2q$ and $+ q$ are placed at points $(x = 0,\ y = a,\ z = 0),\ (x = 0,y = 0,z = 0)$ and $(x = a,y = 0,z = 0)$ respectively. The magnitude and direction of the electric dipole moment vector of this charge assembly are
A) $\sqrt{2}qa$ along $+ y$ direction
B) $\sqrt{2}qa$ along the line joining points $(x = 0,\ y = 0,\ z = 0)$ and $(x = a,y = a,z = 0)$
C) $qa$ along the line joining points $(x = 0,\ y = 0,\ z = 0)$ and $(x = a,y = a,z = 0)$
D) $\sqrt{2}qa$ along $+ x$ direction
Explanation
The correct answer is Option B: $\sqrt{2}qa$ along the line joining points $(x = 0,\ y = 0,\ z = 0)$ and $(x = a,y = a,z = 0)$.
A detailed explanation for this question is being prepared.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.