- #1
tim85ruhruniv
- 15
- 0
Hi,
I am not really sure whether its over the surface of the sphere or the Volume,
the problem and the solution are given below, I want to know how it has been solved.
The [tex]\delta_{0}[/tex] is the dirac delta function.
[tex]\[
\underset{\left|\underline{\xi}\right|=1}{\int}\delta_{0}\left(\underline{\xi}\cdot\underline{z}\right)dS_{\xi}=\intop_{0}^{2\pi}d\varphi\intop_{-r}^{+r}\delta_{0}\left(\varsigma\right)\frac{d\varsigma}{r}=\frac{2\pi}{r}\]
[/tex]
the following variable substitution has been made,
[tex]\[
\varsigma=\underline{\xi}\cdot\underline{z}=rcos\theta\]
[/tex]
Thanx a lot.
I am not really sure whether its over the surface of the sphere or the Volume,
the problem and the solution are given below, I want to know how it has been solved.
The [tex]\delta_{0}[/tex] is the dirac delta function.
[tex]\[
\underset{\left|\underline{\xi}\right|=1}{\int}\delta_{0}\left(\underline{\xi}\cdot\underline{z}\right)dS_{\xi}=\intop_{0}^{2\pi}d\varphi\intop_{-r}^{+r}\delta_{0}\left(\varsigma\right)\frac{d\varsigma}{r}=\frac{2\pi}{r}\]
[/tex]
the following variable substitution has been made,
[tex]\[
\varsigma=\underline{\xi}\cdot\underline{z}=rcos\theta\]
[/tex]
Thanx a lot.