Describe how the magnetic domains in an unmagnetized iron rod will respond to the presence of a strong external magnetic field.
  1. The domains will split into monopoles.
  2. The domains will tend to align with the external field.
  3. The domains will tend to orient themselves perpendicular to the external field.
  4. The domains will tend to align so as to cancel out the external field.
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OpenStax College Physics for AP® Courses, Chapter 22, Problem 3 (Test Prep for AP® Courses)

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Video Transcript
This is College Physics Answers with Shaun Dychko. Because iron is ferro-magnetic, it has magnetic domains that will align with this external field that's applied.