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When calculating the specific permeance in terms of magnetic circuits, an underlying assumption made is that the magnetic field is uniform across the cross-section of the material or component being analyzed. This assumption simplifies the calculation, allowing for the use of average dimensions and properties in the analysis. Essentially, it posits that the flux density (B) and the magnetic field strength (H) are evenly distributed, which enables the approximation of magnetic circuit behavior using simpler mathematical models. However, in reality, the distribution of these fields can be more complex, especially near edges or in materials with non-uniform properties.
Answer: c
Explanation: The mmf is kept constant over all the flux tubes. The mmf should be kept constant when the integration is carried out during the calculation of specific permeance.