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the electric field due to a uniformly charged ring
of radius R and total charge Q > 0 above its center. A small test charge
q < 0 is released from z = 0 with zero initial speed.
(b) The moment the test charge passes the center point, the radius
of the circular ring is halved and its charge is doubled. What is
the maximum distance that the test charge can move along the
z-axis?

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