The figure shows a section of a long, thin-walled metal tube of radius R = 8.70 cm, with a charge p…

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The figure shows a section of a long, thin-walled metal tube of radius R = 8.70 cm, with a charge per unit length A = 6.25 x 10^-8 C/m. What is the magnitude E of the electric field at radial distance (a) r = 4.53 cm and (b) r = 14.3 cm?

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