For fields that do not vary with z in cylindrical coordinates, the equations of the streamlines are
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For fields that do not vary with z in cylindrical coordinates, the equations of the streamlines are obtained by solving the differential equation Ep/Eϕ = dρ/(ρdϕ). Find the equation of the line passing through the point (2, 30°, 0) for the field E = ρ cos 2ϕaρ − ρ sin 2ϕaϕ.
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