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## Homework Statement

Charge Q is uniformly distributed around the perimeter of a semicircle of radius R. What is the electric field at the circle's center?

## Homework Equations

E=kQ/R^2

## The Attempt at a Solution

λ=Q/(∏R)

∫(kλ)/R^2 dθ from 0 to pi

and get the answer to be (kQ)/R^3

or is it

∫(kλ)θR/R^2 dθ from 0 to pi

and get (kλ∏^2)/2R

The second one I was trying to put the arc length in, but I'm not sure if you need to or not.