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## Homework Statement

An electron is released from rest on the axis of a uniform positively charged ring, 0.174 m from the ring's center. If the linear charge density of the ring is +0.150 nC/ m and the radius of the ring is 0.348 m, how fast will the electron be moving when it reaches the center of the ring?

## Homework Equations

ΔU=qΔV

q=λL

ΔU=0.5mv^2

## The Attempt at a Solution

I've tried to find the electric potential at each point,the charge of the ring using q=λL where L i found by using 2∏r. From that, i took the difference between the electric potentials and plugged it into the first equation and equated that to the change in kinetic energy and solved for v but it's not right. can someone see what i did wrong?