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Charge has been placed on a long thin wire, giving a linear charge density of 9.2 nC/m. Surrounding the wire is a long thin-walled hollow cylinder with radius 2.0 cm,that

has also been given a uniform surface charge, resulting in a charge density of -4.7 nC/m along the cylinder. You want to calculate the electric field 4.2 cm fromthe wire. The diagram below shows a small section of the long charged tube/wire combination; in your worked solution draw a similar diagram and use dashed lines to add aGaussian surface suitable for calculating the electric field 4.2 cm from the wire. Show distances on your diagram, and use dashed lines to clearly indicate the Gaussiansurface. Use Gauss's Law with your Gaussian surface to calculate the electric field 4.2 cm from the centre of the tube. Give the value in kN/C, to 1 decimal place.

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