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## 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

[tex]\phi[/tex] = q[tex]_{encl}\epsilon_0[/tex]

or

[tex]\phi[/tex] = q[tex]_{encl}[/tex]/

**[tex]\kappa[/tex]**[tex]\epsilon[/tex]

???