You are an astronaut stranded on a planet with no test...

Name: Problem 5, Chapter 21: Holt Physics
Uploaded: 2020-10-02T23:50:45-08:00
Duration: 1 min 10 s
Channel: Suzanne W.
Description: You are an astronaut stranded on a planet with no test equipment or minerals around. The planet does not even have a magnetic field You have two iron bars in your possession; one is magnetized, one is not. How can you determine which one is magnetized?

You are an astronaut stranded on a planet with no test equipment or minerals around. The planet does not even have a magnetic field You have two iron bars in your possession; one is magnetized, one is not. How can you determine which one is magnetized?

Key Concepts

Magnetic Dipole Interactions

Magnetic dipole interactions refer to the way two magnets interact through their north and south poles. In a permanently magnetized object, the structured dipole can lead to both attraction and repulsion based on the alignment of similar or opposite poles. By contrasting this behavior with the unmagnetized bar—which only demonstrates induced, attractive effects—one can determine which bar has the permanent magnetization.

Magnetic Induction

Magnetic induction is the process by which a ferromagnetic object temporarily develops magnetic properties in the presence of a magnetic field. When an unmagnetized iron bar is near a magnet, it can develop an induced magnetization that causes it to be attracted to the magnet, but it will not exhibit repulsion because the induced polarity always aligns to favor attraction. This induced effect helps differentiate it from a permanently magnetized bar.

Permanent Magnetization

Permanent magnetization refers to the condition where a material’s magnetic domains are locked into a fixed alignment, creating a persistent magnetic field around the object. A permanently magnetized bar will exhibit both attractive and repulsive forces based solely on the orientation of its magnetic poles, independent of external magnetic fields. This is the distinguishing factor when comparing it to an unmagnetized bar, which does not have a built?in dipole moment.

Ferromagnetism

Ferromagnetism is the property of certain materials, like iron, to become magnetized when exposed to a magnetic field. This property arises due to the alignment of magnetic domains within the material, which can be either temporary (induced) or permanent. In the context of the problem, both bars are made from a ferromagnetic material, but only one has a permanent alignment of domains that makes it a permanent magnet.

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