Problem 3.8

A thin half-ring of radius $R=20 \mathrm{~cm}$ is uniformly charged with a total charge $q=0.70 \mathrm{nC}$ . Find the magnitude of the electric field strength at the curvature centre of this half-ring.

E=\frac{q}{2 \pi^{2} \varepsilon_{0} R^{2}}=0.10 \mathrm{kV} / \mathrm{m}

Constant Electric Field in a Vacuum