The actions that are most likely to cause the domains in a ferromagnetic material to align include:
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Rubbing the material against a magnet: This can help to align the magnetic domains due to the influence of the external magnetic field.
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Placing the material in a magnetic field of opposite polarity: While this action may not necessarily align the domains, it can influence alignment negatively. It can demagnetize the material or partially align the domains in the opposite direction.
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Placing the material near a strong magnet: A strong magnetic field can cause the domains in the ferromagnetic material to align in the direction of the field.
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Hitting the material: Physical impact can help to realign the domains; however, it may also disrupt existing alignment, so this is context-dependent.
The following actions are less likely to cause alignment:
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Heating the material: Heating can actually disrupt the alignment of domains by giving them energy to move, thus it generally demagnetizes the material rather than aligning it.
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Passing electricity around the material: While electrical currents can create magnetic fields, this is not a direct method to align the magnetic domains unless it generates a strong enough field or interacts in a specific way with the material.
So, the correct choices regarding alignment of domains are:
- Rubbing the material against a magnet
- Placing the material near a strong magnet
- Hitting the material (context-dependent)