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## Homework Statement

A total charge Q is uniformly distributed on a thread of length L. This thread forms a semicircle. what is the potential at the center? (assume V=0 at large distances)

## Homework Equations

V = -∫Edl

E = kQ/r^2

## The Attempt at a Solution

V = - ∫Edr = -E∫dr = -Er = - kQr/r^2 = -kQ/r

is this correct? I am not sure if the sign should be negative