Question

An electron is released from rest on the axis of a uniform positively charged ring, 0.100 m from the ring's center. If the linear charge density of the ring is +0.149 µC/m and the radius of the ring is 0.200 m, how fast will the electron be moving when it reaches the center of the ring?


Ive been having trouble with the question, i more so just need an idea of what i should be looking for. I've tried using the electric field found by integrating and qEd=KE but no luck :(
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