- #1

grandpa2390

- 474

- 14

## Homework Statement

As always, I wish I were allowed to upload a drawing ;)

This is not a problem, this is a derivation of sorts, so I don't have any numbers.

I have 3 points. one at the origin, a point charge q and a test charge Q

I have a vector from the origin to the point charge q with a magnitude of r' (there was a button for tutorial on typing math, I don't see it).

I have a vector from the origin to the test charge Q with a magnitude of r

the magnitude of the separation vector (vector connecting the point charge with the test charge) is given as ##r - r'##

## Homework Equations

##π = r-r'##

script r that is the vector connecting q and Q

## The Attempt at a Solution

it isn't a problem, it is just a question. I would think t would be some trig function and we would need angles and so forth to calculate this magnitude, but it is just ##r-r'##. If the angle between r and r' were 90 degree (not possible in this case, but I am just giving an example), I would expect the magnitude of π to be the square root of ##\sqrt{r^2+r'^2}##

once again I am sorry for not using the math code, I can't find that button that gave the tutorial. I know a link to it is somewhere on this page (or used to be) but it is eluding me at the moment.

edit I just found the link to the LaTex tutorial (of course I would find it after posting), I am editing it right now. I knew it was right there, but perhaps it wasn't while I was creating the thread.

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