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