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K3nt70
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Homework Statement
A thin rod bent into the shape of an arc of a circle of radius R carries a uniform charge per unit length lambda = 2.20×10-9 C/m. The arc subtends a total angle 2 theta0, symmetric about the x axis, as shown in the figure below. theta0 = 28.0° and R = 0.28 m
Hint: hard to avoid integrating for this one but at least the integral isn't too bad. Remember that the problem asks for the magnitude of the electric field.
Homework Equations
ive tried:
E=[tex]\frac{kq}{r\sqrt{\frac{L^2}{4} + r^2}}[/tex]
The Attempt at a Solution
http://img357.imageshack.us/img357/7853/dgian2149qe4.gif
I found the length of the rod and the charge of the rod using simple circle calculations:
C=2*pi*r
then using C and the 56[tex]^{o}[/tex]:304[tex]^{o}[/tex] ratio, i found the length of the rod. Then using the charge/length given, i found the charge. After i had all my info, i filled it into the equation but got the wrong answer. Any Suggestions?
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