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. 2020 Mar 30;10:5694. doi: 10.1038/s41598-020-61939-7

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Axial distribution of (a) the electrostatic potential (b) the electric field in the radial direction and (b) the electric field in the axial direction at ρ = 0 mm (blue line) and ρ = 2 mm (blue dashed line). The negative sign in the values of (b) is qualitative and implies a direction opposite to the radial unit coordinate vector.