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At a distance of R = 8 mm away from the centre of a long straight thin walled conducting tube the electric field strength

At a distance of R = 8 mm away from the centre of a long straight thin walled conducting tube the electric field strength is E= 0.4 V/m. The outer radius of the tube is r = 4 mm. Calculate the linear charge density on the tube surface in pC/m.

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