Which term describes the material property that governs how easily magnetic flux lines pass through a material?

Which term describes the material property that governs how easily magnetic flux lines pass through a material?

• A. Conductivity
• B. Refractive index
• C. Density
• D. Permeability

Answer: (D)

Permeability describes how easily magnetic flux lines pass through a material. When a magnetic field exists, the field lines can move through space, but materials respond to that field by becoming magnetized to some extent. Permeability measures how readily a material allows those magnetic lines to pass and how strongly the field is carried through it. In formulas, magnetic flux density B is related to the magnetic field strength H by B = μH, where μ is the permeability of the material (often written as μ = μ0 μr, with μ0 the vacuum permeability and μr the relative permeability). Materials with high permeability, like iron, guide magnetic field lines more easily, while non-magnetic materials have permeability close to that of vacuum and have little effect on the field. Conductivity concerns electric currents, refractive index concerns how light travels through a medium, and density concerns mass per volume. So permeability is the property that governs the passage of magnetic flux lines through a material.

Permeability describes how easily magnetic flux lines pass through a material. When a magnetic field exists, the field lines can move through space, but materials respond to that field by becoming magnetized to some extent. Permeability measures how readily a material allows those magnetic lines to pass and how strongly the field is carried through it. In formulas, magnetic flux density B is related to the magnetic field strength H by B = μH, where μ is the permeability of the material (often written as μ = μ0 μr, with μ0 the vacuum permeability and μr the relative permeability). Materials with high permeability, like iron, guide magnetic field lines more easily, while non-magnetic materials have permeability close to that of vacuum and have little effect on the field. Conductivity concerns electric currents, refractive index concerns how light travels through a medium, and density concerns mass per volume. So permeability is the property that governs the passage of magnetic flux lines through a material.