- #1
Mutatis
- 42
- 0
Homework Statement
A distribution of charge with spherical symmetry has volumetric density given by: $$ \rho(r) = \rho_0 e^{ \frac {-r} {a} }, \left( 0 \leq r < \infty \right); $$
where ##\rho_0## and ##a## is constant.
a) Find the total charge
b) Find ##\vec E## in an arbitrary point
Homework Equations
I've already found the answer of a): ## Q_t = 8\pi a^3 \rho_0##
The Attempt at a Solution
To solve b), I've used the Gauss law (spherical symmetry) and that's what I've found $$ \vec E = \frac {4\pi a^3 \rho_0} {r^2} \vec r .$$
This answer seems to me very acceptable, but I've looked at the solutionary and there's another result pretty much complicated. What do you think?