{
  "annotation_id": "5d59ffae-d203-4e2e-9966-04a6ecf1a8c5",
  "date_created": "2026-03-02T18:00:46.023000Z",
  "date_modified": "2026-03-02T18:00:46.023000Z",
  "file_hash": "b9c19a2f96f16f93e1195838d337d86ae51325d20c91912c0ced5e247af0fd49",
  "private": false,
  "record": {
    "abstract": "Despite 180 years of theory on magnetism, it appears that the practice of\ncalculating forces on magnetic media is ambiguous, as illustrated by a recent\narticle by Casperson. Potentially troubling issues include: Which field B or H\nshould be used? Should the total field be used, or only the external field? And\nif the latter, what is meant by \"external\"? Can/should effects of magnetization\ncurrents and/or fictitious magnetic poles be included? What is the force on\nonly a portion of a circuit? We review several well-known approaches to\nmagnetic force calculations on elements of rigid circuits, and find it very\nhelpful to use an explicit example to compare and contrast the various methods.",
    "arxiv_id": "physics/0312027",
    "authors": [
      "Kirk T. McDonald"
    ],
    "categories": [
      "physics.class-ph"
    ],
    "title": "Methods of Calculating Forces on Rigid Magnetic Media",
    "url": "https://arxiv.org/abs/physics/0312027"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "1f2f1f66-35e2-4791-87a9-ae25ff4de599",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}