An infinite insulating cylinder of radius R has a uniform charge density ρ (units: C/m3). What is the magnitude of the electric field at point A, which is r = R/3 from the central axis of the cylinder?
A. ρR / 6ϵ0
B. ρR / 2ϵ0
C. ρR / 4ϵ0
D. 2ρR / 3ϵ0
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