đ Key Concepts
⢠Magnetic permeability and what it means (how easily a material supports magnetic field lines)
⢠Difference between ferromagnetic, paramagnetic, and diamagnetic materials
⢠Typical magnetic behavior of common engineering materials like iron, aluminum, plastics, and glass
đ Think About
⢠First, sort each option into âstrongly magneticâ, âweakly magneticâ, or ânon-magneticâ based on what you know from everyday experience.
⢠Think about which class of materials (ferromagnetic, paramagnetic, diamagnetic) usually has the highest permeability.
⢠Ask yourself: which of these materials is commonly used to concentrate or guide magnetic fields (for example, in transformer cores or electromagnets)?
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Before You Answer
⢠Be clear on the definition: higher permeability = easier for magnetic flux to pass through.
⢠Eliminate materials that are electrical insulators usually used for their non-magnetic properties (for example, common plastics and glass).
⢠Compare the typical use of aluminum versus iron in electrical/magnetic devices and ask which one is actually used to carry magnetic flux, not just conduct electricity.