Problem 7: An infinitely long solid insulating cylinder of radius R and has a uniform volume charge density 0.75 µC/m³. If the magnitude of the electric field 0.55 m from the axis of the cylinder is 3500 N/C, what is R, (the radius of the cylinder), in meters? Assume you are outside of the cylinder of charge (that is, R< 0.55 m). R = m

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