Through which material will magnetic lines of force pass the most readily?

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Multiple Choice

Through which material will magnetic lines of force pass the most readily?

Explanation:
Magnetic lines of force follow the path of least reluctance, which depends on how easily a material can be magnetized. Iron is ferromagnetic, so its magnetic domains align in a magnetic field, greatly increasing the material’s permeability. That makes iron a very low-reluctance path for magnetic flux, so the lines pass through it most readily. In contrast, aluminum and copper are non-magnetic with permeability close to that of air, offering much higher reluctance, and plastic is essentially non-magnetic. So the flux prefers iron, and the lines pass through it much more easily.

Magnetic lines of force follow the path of least reluctance, which depends on how easily a material can be magnetized. Iron is ferromagnetic, so its magnetic domains align in a magnetic field, greatly increasing the material’s permeability. That makes iron a very low-reluctance path for magnetic flux, so the lines pass through it most readily. In contrast, aluminum and copper are non-magnetic with permeability close to that of air, offering much higher reluctance, and plastic is essentially non-magnetic. So the flux prefers iron, and the lines pass through it much more easily.

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