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A uniformly charged insulating rod of length L is bent into the shape of a semicircle as shown in the figure.
The rod has a total charge of Q (>0). Find the magnitude of the electric field at O, the center of the semicircle.
A) keQ /L^2
B) πkeQ /(2L^2)
C) 2πkeQ /L^2
D) 4πkeQ /L^2
E) 2πkeQ^2/L

COs I dr
= sin r+ C
%3D
sin r dr
- cos z+ C
%D

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