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axis centred at the origin)

The charge per unit length along the semicircle is described by the expression λ(θ) = λ0cosθ. The total charge on the semicircle is 13.2 µC.

(a) Calculate the value of the constant λ0.

(b) Calculate the total force on a charge of 3.11 µC placed at the center of curvature.

I did part a i found the answer 1.14e-05 C/m. but for part (b) i cant seem to setup the integral

any help would be appreciated.