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Diagram of the electric field \(E(r)\) of a charged hollow cylinder as a function of the distance \(r\) from the longitudinal axis. The hollow cylinder has the radius \(R\).
- Outside (\(r \gt R\)) of the hollow cylinder, the E-field is proportional to \(1/r\).
- Inside (\(r \lt R\)), however, the hollow cylinder is field-free (Faraday cage).