The figure shows a section of a very long metal tube with a thin wall of radius R= 2.5 cm and a linear charge density of ?=5.4×10/ C/m. What is the magnitude (in N/C) of the electric field at a radial distance of r =R/2? (ϵ₀ = 8.9x10‾¹² C²/Nm²)     A) 6,1x10³ B) 8,8x10³ C) 4,8x10³ D) 0 E) 3,2x10³

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