The inner length of the straight cylindrical conductor coaxial cable radius R = 1,5 mm is charged with a linear density of 0.20 nC / m. The outer cylindrical conductor of the wire radius R 2 = 3 mm is charged with a linear density -0.15 nC / m. The space between the conductors is filled with a rubber (e = 3). Determine the strength of the electrostatic field at points on the axis of the wire at distances of 1) R 1 = 1 mm; 2) R 2 = 2 mm; 3) R 3 = 5 mm.

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