Problem 3.371

A point charge \(q\) moves uniformly and rectilinearly with a relativistic velocity equal to a \(\beta\) fraction of the velocity of light \((\beta=v / c) .\) Find the electric field strength \(\mathbf{E}\) produced by the charge at the point whose radius vector relative to the charge is equal to \(\mathbf{r}\) and forms an angle \(\theta\) with its velocity vector.