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91. По тонкому проводнику, изогнутому в виде правильного шестиугольника со стороной а = 10 см, идет ток I = 20 А. Определить магнитную индукцию В в центре шестиугольника.
91. По тонкому проводнику, изогнутому в виде правильног
