that is what I'm confuswed about...if the insulating sphere is made of a material other than air, which one should I use on the righthand side of the flux equation? \epsilon_{0} or \epsilon. that is should I take the permittivity constant (\kappa) into account or not?
Homework Statement
ok here's the problem: find the magnitude of the electric field inside uniformly charged insulating sphere of raduis R.
Homework Equations
application of gauss's law..but...
The Attempt at a Solution
should i use
\phi = q_{encl}\epsilon_0
or
\phi =...