Solving a problem in physics section 1 point 7 electros

7. thin wire bent along an arc of a circle, evenly distributed with the linear charge density τ = 10 nC / m. Determine the strength and potential of the E φ of the electric field generated by this charge distribution in the point coinciding with the center of curvature of the arc. The length l of the filament is 1/3 of the circumference and is 15 cm.