Types of Magnetic Permeability
There are two types of Magnetic Permeability that can be calculated for any material i.e.,
- Absolute Magnetic Permeability (μ)
- Relative Magnetic Permeability (μr)
Absolute Permeability (μ)
Absolute permeability (μ), often simply referred to as permeability, is a material-specific property that quantifies its intrinsic ability to carry magnetic flux.
The relationship between magnetic field strength (H), magnetic flux density (B), and absolute permeability (μ) is given by:
H = B / μ
Where:
- H is the magnetic field strength in amperes per meter (A/m).
- B is the magnetic flux density in teslas (T).
- μ is the absolute permeability in henrys per meter (H/m).
Relative Permeability (μᵣ)
Relative permeability is a dimensionless quantity that is defined as the ratio of material’s permeability to the permeability of a vacuum (μ₀).
Relative Permeability is often denoted as μᵣ and is given by:
μr = μ / μ0
Where:
- μ is the absolute permeability of the material.
- μ₀ (mu-zero) is the absolute permeability of free space or vacuum, which is approximately 4π × 10-7 H/m in SI units.
Note: Materials with μᵣ > 1 are considered magnetically susceptible, meaning they can amplify an applied magnetic field, while μᵣ < 1 indicates materials that weaken the field.
Magnetic Permeability
Magnetic Permeability is a fundamental concept in electromagnetism that describes how a material responds to the influence of an external magnetic field. The term was introduced by Oliver Heaviside in 1885, marking a significant contribution to the understanding of electromagnetic phenomena.
Magnetic permeability is essentially the ability of a material to allow the passage of magnetic lines of force. This property determines the material’s capacity to support and allow the passage of magnetic flux through it. In this article, we will discuss all the topics related to the concept of Magnetic Permeability.
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