Задача 30969.

The figure shows a charged horizontal thread BD (t = -2 nC/cm) and a plane MN (sigma = 0.03 nC/cm^2); a = 30 cm. Find: the force acting from the electric field on a point charge q0 = -1 nC at point A; the change in the potential energy of this charge in an electric field when it moves from point A to point C.

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