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Answer: c
Explanation: Specific permeance is defined as permeance per unit length. It is also
known as the depth of field.
Specific permeance, often used in the context of magnetic circuits, is the measure of the ease with which magnetic flux can pass through a particular segment of the magnetic circuit. It quantifies the permeability of a material to magnetic flux, similar to how specific conductance quantifies the ease with which electrical current can flow through a material. Specific permeance is inversely related to magnetic reluctance, which is a measure of the opposition to the passage of magnetic flux, analogous to electrical resistance in an electrical circuit.
Specifically, permeance (P) is defined by the equation P = μA/l, where:
– (μ) (mu) represents the permeability of the material (which is the product of the relative permeability of the material (mu_r) and the permeability of free space (mu_0)),
– (A) is the cross-sectional area through which the magnetic flux is passing, and
– (l) is the length of the path that the magnetic flux takes through the material.
Thus, specific permeance can be thought of as a measure of how well a given length and cross-section of a material will allow magnetic flux to pass through it, taking into account the material’s magnetic properties. High specific permeance in a material indicates that it allows magnetic flux to flow through it easily, making it suitable for use in magnetic cores of transformers, inductors, and other electromagnetic devices.