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## Homework Statement

A charge Q is arranged evenly on a wire bent into an arc or radius R as shown in the

Figure. What is the electric field at the center of the arc as a function of the opening

angle theta? Sketch a graph of the electric field as a function of theta for 0<theta<180 degrees.

## Homework Equations

E= KQ/R^2 cos theta

## The Attempt at a Solution

Is the above equation correct? If not, I'm not really sure what to do, also I'm not sure how the graph should look.