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22.2 Ferromagnets and Electromagnets
Magnetic domains and how aligning them magnetizes iron, the Curie temperature that wipes that order out, and current-driven electromagnets.
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2 exercises
22.2 Exercise 1
A bar magnet is oriented so that the north pole of the bar magnet points north. A compass needle is placed to the north of the bar magnet. In which direction does the north pole of the compass needle point?
- North
- East
- South
- West
2.5
22.2 Exercise 3
Describe how the magnetic domains in an unmagnetized iron rod will respond to the presence of a strong external magnetic field.
- The domains will split into monopoles.
- The domains will tend to align with the external field.
- The domains will tend to orient themselves perpendicular to the external field.
- The domains will tend to align so as to cancel out the external field.
2.5
Adapted from College Physics © 2022 Rice University. Licensed under CC BY 4.0. Sources: College Physics 2e, College Physics for AP® Courses 2e. Imported at revision f98d7a7.