{
  "source_practice": {
    "title": "Энергетическая производная при двух шагах",
    "parameters": [
      {
        "name": "Зазор",
        "value": "1",
        "unit": "мм"
      },
      {
        "name": "Ток",
        "value": "1",
        "unit": "А"
      },
      {
        "name": "Шаги зазора",
        "value": "0,05; 0,025",
        "unit": "мм"
      }
    ],
    "steps": [
      "Сначала определите положительную координату движения и знак силы в отчёте.",
      "Выполните базовый статический расчёт, затем два перемещения якоря при неизменном токе.",
      "Для каждого положения выберите все необходимые области поля и вычислите коэнергию mo_blockintegral(17).",
      "Получите центральную производную, переведя шаг из миллиметров в метры. Повторите с половинным шагом.",
      "Выберите только тело якоря и сравните составляющую силы с интегралом взвешенного тензора: 18 для \\(x\\), 19 для \\(y\\).",
      "Для отдельного эксперимента сохраните рабочее .ans и задайте mi_setprevious(...,1) либо (...,2). В подписи результата укажите выбранный тип."
    ],
    "expected": "Два способа определения силы и два шага виртуального перемещения; тип проницаемости обозначен явно.",
    "verification": "Неизменность физических токов проверена; согласованы знак координаты и единица производной.",
    "table_number": "31.8"
  },
  "source_assignment": {
    "task": "Получите силу при двух токах и двух зазорах, сравните масштаб \\(I^{2}\\)/\\(\\delta^{2}\\) и объясните отклонения насыщенной модели.",
    "acceptance": "Сила вычислена двумя способами; шаг и сетка проверены; знаки, области интегрирования и использование предыдущего решения описаны."
  },
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