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In a closed [[/magnetic circuit]], the [[/magnetic flux]] can be equated to the product of the average [[/magnetic flux density]] //B// and effective [[/cross-sectional area]] //A//; note that all the flux lines remain inside the [[/magnetic core]].

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{{tag> Magnetic_flux Magnetic_flux_density Cross-sectional_area Magnetic_core Magnetic_circuit Toroidal_core Toroid Frame_core Magnetic_field_lines Flux_lines Files}}