By best idea was also to use Gauss' law. ## \int_V \mathbf{\nabla} \cdot \mathbf{E} \, d\tau = \frac{1}{\epsilon_0} \, Q_{enclosed} ##
How can I avoid evaluating any actual integrals?
The charge density/ elctric field depends on both r and theta.
Homework Statement
a) and b) are no problem.
I need help to solve c) and d)
Homework Equations
c) Delta dirac function
Gauss' law
d) Gauss' law
## \int_V {\rho \, d\tau} = Q_{enclosed} ##
The Attempt at a Solution
By taking laplace on the potential I get:
## \rho(\mathbf{r}) =...
Homework Statement
Show that the ratio of the blackbody fluxes from a star at two different frequencies (i.e., a color) is measured, then, in principle, the surface temperature of the star can be derived, even if the star's solid angle on the sky is unknown (e.g., if it is too distant to be...