Centre of charge ?

1. Feb 28, 2006

gandharva_23

if i have 3 unequal point charges located on the vertices of an equilateral triangle then can i assume the whole charge to be concentrated at one point to represent the whole system ? i.e one can assume the entire charge to be concentrated at that point for the purpose of calculating the electric field intensity ? can we derive a general expression for coordinates of center of charge like center of mass ?

2. Feb 28, 2006

Staff: Mentor

The electric field of a collection of individual charges is the vector sum of the electric field of each charge.

At large distances, the electric field approaches that which would be given by a point charge of the magnitude of the total charge.

Yes - a coordinate system is a key part.

3. Feb 28, 2006

gandharva_23

thanx a lot sir ..........