A total charge Q is uniformly distributed around a ring- shaped conductor with radius a. A...

A total charge Q is uniformly distributed around a ring- shaped conductor with radius a. A charge q is located at a distance x from the center of the ring (Fig. P5.17). The force exerted on the charge by the ring is given by

where e0 = 8.9 × 10-12 C2/(N m2) Find the distance x where the force is 1.25 N if q and Q are 2 x 10-5 C for a ring with a radius of 0.85 m.