- #1
jhosamelly
- 128
- 0
Homework Statement
I should derive
[itex]\vec{F_{q}} = \frac{-q'^{2}}{4∏ \epsilon_{0}} \frac{r'/a}{(r'^{2} - a^{2})} \hat{r}[/itex]
from
[itex]\vec{F_{q''q'}} = k\frac{q' q''}{\left|\vec{x'} - \vec{x''}\right|^{2}}[/itex]
Homework Equations
The Attempt at a Solution
I know that [itex] q'' = -q' \frac{a}{r'} [/itex]
and [itex] r'' = \frac{a^{2}}{r'} [/itex]
so, I substituted these. but I can't seem to arrive at the correct formula.