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4) A charge O = -610 nC is uniformly distributed on a ring of 2.4-m radius. A point charge q = +480 nC is fixed at the center of the ring, as shown in the figure. A proton is projected from infinity toward the ring along the axis of the ring. This proton comes to a momentary halt at a point on the axis that is 5.75 cm from the center of the ring. What is the initial speed of the proton at infinity? (e = 1.60 x 10-19 C, k= 1/4x80 = 8.99 x 109 N . m2/C2, mel = 9.11 x 10-31 kg) 2.4 m 9 = +480 nC Q = -610 nC