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seang
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Homework Statement
How do I find the electric field from a semi-ring of charge at the center of the would-be circle? Does that make sense? Or another way: If the semi-circle of charge is centered at the origin, what is the electric field at the origin? I hope you know what I mean now.
the total charge of the ring is Q, the radius is R.
Oh yeah, the semi circle is in the left hand plane
Homework Equations
[tex]
E = k\int_{}^{l}\frac{(r-r')\rho _l(r')}{|r-r'|^3} dl'
[/tex]
The Attempt at a Solution
[tex]
E = k\int_{\pi/2}^{-\pi/2}\frac{(-r')\rho _l(r')}{|-r'|^3} d\theta
[/tex]
Is converting to cylindrical coordinates the right move? Is this even the equation I should be using? What should I use as the charge density?
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