Which material has the lowest magnetic permeability among common conductors listed?

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Multiple Choice

Which material has the lowest magnetic permeability among common conductors listed?

Explanation:
Magnetic permeability measures how easily a material supports and concentrates magnetic flux. Iron is ferromagnetic, so its permeability is much higher than ordinary materials. Copper and aluminum are good conductors but are essentially non-magnetic, with permeability very close to that of air. Plastic is typically non-magnetic and often diamagnetic, giving it a permeability at or just below 1, usually the smallest among these options. Therefore, plastic has the lowest magnetic permeability among the listed materials.

Magnetic permeability measures how easily a material supports and concentrates magnetic flux. Iron is ferromagnetic, so its permeability is much higher than ordinary materials. Copper and aluminum are good conductors but are essentially non-magnetic, with permeability very close to that of air. Plastic is typically non-magnetic and often diamagnetic, giving it a permeability at or just below 1, usually the smallest among these options. Therefore, plastic has the lowest magnetic permeability among the listed materials.

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