Question: For fields that do not vary with z in cylindrical coordinates, the equations of the streamlines are obtained by solving the differential equation E p

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

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