- #1
dingo_d
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Homework Statement
I'm looking at Y.K.Lim's Problems and solutions in Electromagnetism and there's one thing that's confusing me:
[PLAIN]http://img545.imageshack.us/img545/2218/capturegb.png
Homework Equations
Where does the square in r comes from? When in the beginning it says that the electric field is:
[tex]E=A\frac{e^{-br}}{r}e_r[/tex] not[tex]E=A\frac{e^{-br}}{r^2}e_r[/tex]
What am I missing?
And what should [tex]e_r[/tex] stand for? Charge?
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