**1. The problem statement, all variables and given/known data**
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.

**2. Relevant equations**
ive tried:

E=

**3. The attempt at a solution**
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

:304

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?