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What is a permeable substance?
Any good conductor
Any bad conductor
Any strong magnet
Any substance through which the magnetic lines of force can pass easily
Any substance through which the magnetic lines of force can pass easily
A permeable substance is a material that allows magnetic lines of force to pass through it with ease, offering low reluctance to the magnetic flux. Permeability is the measure of a material's ability to support the formation of a magnetic field within itself.
A permeable substance is a material that allows magnetic lines of force to pass through it with ease, offering low reluctance to the magnetic flux. Permeability is the measure of a material's ability to support the formation of a magnetic field within itself.
B=╬╝H тАФ Relation between magnetic flux density B and magnetizing force H
╬╝=╬╝0тАЛ╬╝rтАЛ тАФ Absolute permeability as a product of permeability of free space ╬╝0тАЛ and relative permeability ╬╝rтАЛ
R=╬╝AlтАЛ тАФ Reluctance of a magnetic path
When a permeable material is placed within a magnetic field, the magnetic lines of force prefer to pass through the material rather than through the surrounding air because the material provides a path of significantly lower magnetic reluctance.
Relative permeability (╬╝rтАЛ) for ferromagnetic materials is much greater than 1 (╬╝rтАЛтЙл1).
High permeability corresponds to low magnetic reluctance (R).
Permeability is the magnetic equivalent of electrical conductivity.
Reduces the magnetizing current required to produce a given magnetic flux.
Concentrates magnetic flux lines tightly within transformer and machine cores.
High-permeability materials can reach magnetic saturation at high flux densities.
Ferromagnetic permeable materials exhibit hysteresis losses when subjected to AC fields.
Transformer cores to maximize flux linkage between windings.
Stator and rotor cores of electric motors and generators.
The permeability of free space (╬╝0тАЛ) is 4╧А├Ч10┬░тИТ7┬аH/m.
Option A and B refer to electrical conductivity, not magnetic permeability.
Option C refers to a permanent magnet, whereas permeability applies to any material that easily conducts magnetic flux regardless of whether it is permanently magnetized.
D is correct тАФ A permeable substance is defined by its ability to easily allow magnetic lines of force to pass through it.
In transformer and rotating machine design, high permeability core materials like cold-rolled grain-oriented (CRGO) steel are selected specifically to minimize reluctance and lower excitation current.