EM notesElectric and Magnetic FieldsElectric Field of a LineElectric Field of a Line We'll be doing this one in cylindrical coordinates, guys (symmetry, ofc). This aint no 1st sem physics topic. dQ=ρl×dZ;ρl=line charge density dE⃗=ρl×dZ[ρ^] dQ = \rho_l \times dZ ; \rho_l = \text{line charge density} \\\ \vec{dE} = \rho_l \times dZ [\hat{\rho}] dQ=ρl×dZ;ρl=line charge density dE=ρl×dZ[ρ^]