Asked by son
Which scenario demonstrates the importance of magnetic domains in determining if a material is magnetic?
A plastic ruler is attracted to hair after being rubbed.
A silver coin is shiny and does not rust.
A piece of iron becomes magnetic after being stroked with a magnet because its domains align.
A copper wire conducts electricity.
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"A piece of iron becomes magnetic after being stroked with a magnet because its domains align."
Explanation: ferromagnetic materials (like iron) contain magnetic domains whose orientations determine magnetization. Stroking with a magnet aligns the domains, producing a net magnetic field. The other examples involve electrostatic attraction (plastic ruler), chemical/optical properties (silver coin), or electrical conductivity (copper), not domain alignment.
Explanation: ferromagnetic materials (like iron) contain magnetic domains whose orientations determine magnetization. Stroking with a magnet aligns the domains, producing a net magnetic field. The other examples involve electrostatic attraction (plastic ruler), chemical/optical properties (silver coin), or electrical conductivity (copper), not domain alignment.
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