Two large thin plane sheets, each having surface charge density \(\sigma\), are held close and parallel to each other in air. What is the net electric field at a point (i) inside and (ii) outside the sheets ?
Show Hint
For two large parallel sheets carrying charges \(+\sigma\) and \(-\sigma\):
\[
\boxed{
E_{\text{inside}}
=
\frac{\sigma}{\varepsilon_0}
}
\]
and
\[
\boxed{
E_{\text{outside}}=0
}
\]
This arrangement forms a parallel-plate capacitor, where the electric field is uniform between the plates and zero outside.