- #1
haaj86
- 17
- 0
Hi, I want to calculate the potential energy between two opposite charges (a dipole) and I know how to integrate Coulomb’s law in the polar form, i.e. in terms of “r”
[tex]\[
U=\int\mathbf{F}d\mathbf{r}=-\frac{e^{2}}{4\pi\epsilon_{0}}\int\frac{1}{\mathbf{r^{2}}}d\mathbf{r}=\frac{e^{2}}{4\pi\epsilon_{0}}\frac{1}{r}\][/tex]
But I want to know how to integrate it when it’s in the Cartesian form i.e.
[tex]\[
F(x,y,z)=\frac{qQ}{4\pi\epsilon_{0}}\frac{1}{[x^{2}+y^{2}+z^{2}]^{\frac{3}{2}}}\left(\begin{array}{c}
x\\
y\\
z\end{array}\right)\][/tex]
Please I need this urgently, and I’m more interested on how to do the integral because I need this for a much more complicated problem that involves moving charges but if I can’t do it for the stationary charges then I can’t do it for that problem. Please I don’t want anybody to suggest integrating the force in the polar form and then changing the variables to Cartesian because as I said I need to know how to do the integral.
[tex]\[
U=\int\mathbf{F}d\mathbf{r}=-\frac{e^{2}}{4\pi\epsilon_{0}}\int\frac{1}{\mathbf{r^{2}}}d\mathbf{r}=\frac{e^{2}}{4\pi\epsilon_{0}}\frac{1}{r}\][/tex]
But I want to know how to integrate it when it’s in the Cartesian form i.e.
[tex]\[
F(x,y,z)=\frac{qQ}{4\pi\epsilon_{0}}\frac{1}{[x^{2}+y^{2}+z^{2}]^{\frac{3}{2}}}\left(\begin{array}{c}
x\\
y\\
z\end{array}\right)\][/tex]
Please I need this urgently, and I’m more interested on how to do the integral because I need this for a much more complicated problem that involves moving charges but if I can’t do it for the stationary charges then I can’t do it for that problem. Please I don’t want anybody to suggest integrating the force in the polar form and then changing the variables to Cartesian because as I said I need to know how to do the integral.