Задача 31026.

A thin, very long rod is uniformly charged with a linear charge density of 10 μC / m. On the extension of the axis of the rod at a distance of a = 20 cm from its end, there is a point charge q = 10 nC. Find the work of the electrostatic field forces when the charge q moves along the axis of the rod to a distance of b = 40 cm.

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