Задача 30790.

A dielectric cylinder of radius r with a dielectric constant e is inserted along the axis of a flat capacitor with round plates. The radius of the capacitor plates 3r, the distance between them d. Find the modulus of the magnetic field at a distance of 2r from the axis of the capacitor if the voltage on its plates increases linearly with time: V = at, where a is the known constant.

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