Solution to task 320 from Chertov´s for extramural stud

Solution to task 320 from Chertov´s for extramural stud

320. Two-thirds of a thin ring with a radius of R = 10 cm carry a charge uniformly distributed with a linear density τ = 0.2 μC / m. Determine the strength E of the electric field created by the distributed charge at the point O, which coincides with the center of the ring.