{{ /half_area_e-m.png?500 }} 

[[/Magnetic circuit]] with constant [[/magnetic flux]], in which [[/magnetic flux density]] doubles where the [[/cross-sectional area]] reduces by half.

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<box round 75% #aaffaa>
  half_area_e-m.png
{{page>insert/file-sz-cc}}
</box>

{{tag> Magnetic_flux Magnetic_flux_density Cross-sectional_area Magnetic_circuit Files}}