A thin, nonconducting ring of radius \(R\) carries a total positive charge \(Q\) distributed uniformly along its circumference. A small test particle of positive charge \(q\) is constrained to move along the central symmetry axis (\(z\)-axis) perpendicular to the plane of the ring. In terms of \(q\), \(Q\), \(R\), and fundamental constants, what is the maximum magnitude of the electrostatic force exerted on the test particle by the ring?