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Considering electromagnetic circuits, which of the following is unit less?
  • a)
    Permeance
  • b)
    Reluctance
  • c)
    Relative permeability
  • d)
    Absolute permeability
Correct answer is option 'C'. Can you explain this answer?
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Considering electromagnetic circuits, which of the following is unit l...
Permeability:
  • In Electromagnetism, permeability is the measure of magnetization that a material obtains in response to an applied magnetic field.
  • It is denoted by the greek letter μ, it is measured in Henries per meter (H/ m).
  • Relative permeability is the ratio of the permeability of a specific medium to the permeability of free space.
  • Since relative permeability is the ratio of two quantities with the same units, so it is unit less.
Where μ = permeability of a specific medium
μ∘ = Permeability of free space
μr = Relative permeability 
Conclusion: Hence, it is a dimensionless quantity and is equal to 1 for a vacuum (Free Space).
Additional Information
Permeance:
  • It is the measure of the ease with which flux can be set up in a material.
  • It is analogous to the conductance of the electrical circuit.
  • In Electromagnetism, permeance is the inverse of reluctance.
Reluctance:
  • The reluctance of a magnetic material is its ability to oppose the flow of magnetic flux.
  • It is analogous to the resistance of the electrical circuit.
  • It is the ratio of the magnetomotive force (m.m.f) to the magnetic flux in the magnetic circuit.
Absolute Permeability:
  • Absolute permeability is given by the ratio of magnetic flux density (B) to the intensity of the magnetic field in the particular medium.
  • The absolute permeability of the free space is equal to a constant equal to 4π × 10-7 H/ m.
  • The absolute permeability of the other medium is given by the formula:
  • μ = μ∘μr.
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Considering electromagnetic circuits, which of the following is unit less?a)Permeanceb)Reluctancec)Relative permeabilityd)Absolute permeabilityCorrect answer is option 'C'. Can you explain this answer?
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