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The flux density is set at the most the core material can stand, which for standard laminated transformer iron is around 1 Weber per square metre. Based on that and the cross-section area of the core, the volts per turn figure is calculated for both the primary and the secondary winding.

If the operating voltage stays constant, so will the flux density and the iron losses.

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Q: How the losses will reduce if you keep the flux density in high level in power transformer?
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