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Homework Statement
Very thin wire bent into the shape of a quartercircle with the radius R is uniformly charged with electric charge q.
Calculate the potential and intensity of the electric field at point A, which lies on a line perpendicular to the plane of the semicircle and is passing through the center of its curvature at a distance a from the center. The wire is in the vacuum.
Homework Equations
I am integrating through the length of the conductor, where all the variables seem to be the constants. Is it correct?
How would it look like if I took into account the changing of the angle?
The Attempt at a Solution
see the picture

this is my first post, greetings to all of you and thanks for the help
Lukas
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