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Electric potential \(\varphi\) of a hollow sphere as a function of distance \(r\). The hollow sphere has the radius \(R\).
- Outside (\(r \gt R\)) of the hollow sphere, the potential \(\varphi\) is proportional to \(1/r\) as for a point charge.
- Inside (\(r \lt R\)), however, the electric potential \(\varphi\) is constant.