(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

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]

2. Relevant equations

3. 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.

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# Homework Help: Derive Electrostatic Force from Coulomb's Law.

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