- #1
grandpa2390
- 474
- 14
Homework Statement
Four particles are each placed a distance a from the origin
3q at (0,a)
-2q at (a,0)
-2q at (-a,0)
q at (0,-a)
find the simple approximate formula for the potential valid at points far from the origin. Express in Spherical coordinates
Homework Equations
P=qr
##V = \frac{1}{4*pi*ε_o}*\frac{p*r}{r^2}##
The Attempt at a Solution
the first step seems to be to say that
I don't understand this.
The way I did this was to use the law of cosines and I added the potentials up for some point r distance away From the origin due to the four point charges. This gave me a big mess. this is supposed to be the official soln.
I don't understand why the z component is just the two charges on the z axis, and y the y component is just the charges on the y axis. doesn't each charge affect each component?